The Most Dangerous Person in Your Marriage Isn't the One You're Sleeping With
Monday, July 20, 2026.
Although we have our differences, One of the things I admire about Esther Perel is that she understands something many therapists miss: marriage doesn't end the story of desire.
It simply changes the rules.
Long after the wedding, people still notice beauty.
They still experience longing. They still wonder who they might have become had life taken a different turn.
Pretending otherwise doesn't make those feelings disappear. It only drives them underground.
Recently, Esther published a letter from a man who described a predicament that is far more common than most happily married people are willing to admit.
He loves his wife.
He has loved her for nearly two decades.
Together they have weathered illness, grief, career disappointments, and all the ordinary catastrophes that slowly transform romance into something sturdier.
Reading his letter, you never doubt his devotion.
In fact, one of the most striking features of his story is that he isn't looking for an exit.
He isn't searching for permission to leave his marriage. If anything, he's searching for a way to stay faithful to it.
And yet.
For years he has maintained an intermittent friendship with a woman he knew in graduate school.
Their relationship has unfolded almost entirely through long emails, thoughtful conversations, and a shared love of books, ideas, and art.
Nothing sexual has happened. Nothing overtly romantic has been said. Both have been careful about boundaries.
Still, something unsettling has taken root.
He finds himself thinking about her.
Missing her.
Wondering about the life they never had.
Most revealing of all, he writes that this woman "brings me in touch with some of the best parts of myself."
That sentence deserves to be read twice.
Because I don't think it tells us anything salient about the woman in question.
I think it tells us about way more about him.
Esther approaches the letter by asking an important question: Has this become an emotional affair?
It's exactly the question many experienced couples therapists would ask, and for good reason.
Emotional intimacy can migrate outside a marriage long before anyone notices that fidelity has quietly become divided.
But if this man had walked into my office, I don't think that's where I would begin.
Not because the question is unimportant.
Because I don't think it's the deepest one.
Therapists are trained to identify boundary crossings. We listen for secrecy, emotional exclusivity, idealization, and displacement of intimacy. Those are important clinical markers.
But before I asked him whether he thought he was having an emotional affair, I would ask something else. I’d explore the narrative gravity.
What psychological job is this woman performing in your life?
That question changes everything.
Because there is another possibility hiding in plain sight.
What if he isn't primarily in love with another woman?
What if he's in love with the version of himself that only seems to exist when he's with her?
That isn't a question about fidelity.
It's a question about identity.
And I suspect it's the real story hiding inside his letter.
We Don't Just Fall in Love With People
One of the quiet assumptions in the letter is that his feelings must be telling him something about her.
I think they may be telling him something about himself.
Notice what he actually says.
He doesn't spend paragraphs describing her beauty.
He doesn't describe overwhelming sexual chemistry.
He doesn't fantasize about escaping his marriage or starting a new life in Tuscany where they will spend afternoons discussing Dostoevsky over espresso. (The imagination is nothing if not ambitious.)
Instead, he says something much more psychologically revealing:
"She brings me in touch with some of the best parts of myself."
That is an extraordinary sentence.
Read it carefully.
He doesn't say she completes him.
He doesn't say she rescues him.
He says she reconnects him with himself.
The Hidden Meaning Inside One Sentence
As therapists, we're trained to listen for these moments because life partners often tell us exactly what's happening without realizing they've done it.
They think they're describing another person. They're actually describing an internal experience.
This woman has become associated with curiosity.
With literature.
With thoughtful conversation.
With intellectual play.
With possibility.
She represents a version of him that feels expansive rather than merely competent.
When Marriage Becomes Efficient Instead of Expansive
There is an important distinction here.
Many marriages become extraordinarily good at running a life together.
Children are raised.
Parents are buried.
Mortgages are refinanced.
Calendars are synchronized.
Dogs are walked.
The refrigerator gets repaired.
The marriage becomes a marvel of cooperation.
But cooperation, while essential, is not the same thing as expansion.
Somewhere along the way, many couples become experts in managing life while quietly forgetting to enlarge each other's inner worlds.
That isn't a moral failure.
It's what happens when adulthood becomes relentlessly practical.
The marriage slowly becomes the place where life is administered instead of discovered.
She Didn't Create This Part of Him
Then, one day, someone arrives who asks a different question.
Not because they're making conversation.
Because they genuinely want to know.
Suddenly, a room you forgot existed inside yourself lights up.
It feels intoxicating.
And here's where many people make a very understandable mistake.
They assume the other person created that room.
More often, they simply found the light switch.
That distinction matters enormously.
Because if she created the room, then he needs her.
But if she merely illuminated it, then what he is longing for has belonged to him all along.
The Better Therapeutic Question
Now the clinical task changes.
Instead of asking, "How do I stop loving this woman?"
We begin asking a far more hopeful question.
"When did I stop inhabiting this part of myself?"
When did books become something I used to love?
When did conversations become transactions?
When did wonder become optional?
When did I become so busy maintaining my life that I stopped enlarging it?
Those questions are deeply uncomfortable.
They are also far more likely to strengthen a marriage than simply deciding whether another relationship has crossed an invisible line.
Because the opposite of an affair is not fidelity.
The opposite of an affair is vitality.
People who feel psychologically alive are still capable of attraction, of course. They are still human. But they are less likely to recruit another person to carry the abandoned pieces of themselves.
The greatest danger isn't that this man has met an extraordinary woman.
And that belief, more than his feelings themselves, is what deserves our attention.
The Problem Isn't the Other Woman. It's the Unlived Life.
There is another force quietly operating beneath this man's story.
It isn't infidelity.
It isn't even desire.
It's grief.
Not grief for a person.
Grief for a life that never happened.
Psychologists don't spend nearly enough time talking about the emotional power of the unlived life.
Every significant choice creates an invisible cemetery of abandoned possibilities.
The career you didn't pursue.
The city you never moved to.
The child you never had.
The novel you never wrote.
The friendship that almost became a romance.
Most of the time, those alternate lives remain pleasantly out of focus. They drift through our imagination like old photographs stored in a drawer somewhere. We know they're there, but they rarely demand our attention.
Then something unexpected happens.
A person from one of those abandoned timelines reappears.
Suddenly, the life you didn't live acquires a face.
It speaks.
It laughs.
It remembers the same professors.
It quotes the same books.
It asks about ideas instead of appointments.
And what had once been an abstract possibility begins to feel emotionally real.
That can be profoundly disorienting.
Memory Is a Terrible Marriage Counselor
One of the reasons this relationship feels so powerful is that it has been remarkably protected from reality.
They've never had to negotiate whose turn it is to empty the dishwasher.
They've never argued over money.
They've never spent six sleepless nights caring for a sick child.
They've never tried to assemble IKEA furniture together, which remains one of psychology's least appreciated assessments of relational resilience.
Their relationship has existed almost entirely in a space where each encounter is chosen.
That matters.
Real intimacy accumulates disappointment.
Memory does something similar.
It preserves emotional highlights while quietly discarding the mundane details that make every long-term relationship both difficult and deeply human.
This isn't because memory is dishonest.
It's because memory is an artist.
The Fantasy Doesn't Need to Be False to Be Incomplete
When therapists hear the word fantasy, partners often assume we're talking about delusion.
We're not.
Fantasy can contain genuine emotion.
Real admiration.
Authentic affection.
Even love.
What it cannot contain is sufficient evidence.
This man knows enough about this woman to admire her.
He does not know enough to imagine an actual shared life with confidence.
Those are very different things.
Every enduring relationship eventually encounters boredom.
Misunderstanding.
Illness.
Financial stress.
Conflicting priorities.
The thousand tiny negotiations that slowly convert romance into partnership.
His marriage has already survived those tests.
His imagined future with this woman has not yet taken a single one.
That doesn't make one relationship superior.
It simply means they exist under entirely different conditions.
Comparing them as though they occupy the same psychological territory is like comparing an architectural sketch to a house that's weathered thirty winters.
The other is proof.
The Question I'd Ask in My Office
I’m pretty direct in my approach in these sort of cases. Eventually I would lean forward and ask him something I suspect no one else has asked:
"If she called tomorrow and said, 'I've loved you for years. Leave your marriage and let's build a life together,' what do you imagine would happen next?"
Most clients answer that question by describing relief.
I'd ask them to keep going.
What happens six months later?
Five years later?
Twenty years later?
Who buys groceries?
Who apologizes after the first truly painful argument?
Who cares for aging parents?
Who notices that the mortgage is due?
Who disappoints whom?
Not because romance disappears.
Because reality eventually arrives.
And reality has a way of introducing itself to every love story, no matter how extraordinary its beginning.
The Real Longing
This is why I don't think his deepest longing is for another woman.
I think his deepest longing is for a life in which he feels intellectually awake, emotionally curious, and psychologically expansive.
Right now, she has become the symbol of that life.
Symbols are powerful.
But they are also dangerous.
Because once we confuse the symbol with its meaning, we begin believing that another person possesses something that has actually been waiting inside us all along.
The task isn't simply to decide whether this friendship should continue.
The task is to recover the parts of himself that have become dependent upon her presence for their expression.
If he can do that, he'll be in a far better position to decide what belongs in his marriage, what belongs in friendship, and what belongs to memory.
Only then will his decision be guided by clarity rather than longing.
Should He End the Friendship?
Eventually every discussion like this arrives at the same question.
"So...should he stop talking to her?"
Most relationship advice answers that question far too quickly.
One camp says yes.
Immediately.
Block her.
Delete the emails.
Never look back.
The other camp says feelings aren't actions.
As long as nothing physical or romantic has happened, what's the harm?
I find both answers unsatisfying.
They focus on behavior before they understand function.
As science-based couples therapists, we're trained to ask a deceptively simple question:
What job is this relationship doing?
That's where I would begin.
If this friendship primarily nourishes his curiosity, reminds him to read, expands his thinking, and helps him become a more interesting husband, father, friend, and human being, then eliminating it may simply remove the symptom while leaving the underlying hunger untouched.
But if this woman has become the person he most wants to tell good news to...
If she's the first person he thinks about after an important day...
If he edits stories before telling them to his wife because he wants to save them for someone else...
If she has become his primary witness...
Then something important has already shifted.
Not because they've broken a rule.
Because emotional gravity has quietly changed direction. if that is the case, he needs to end contact with concrete finality.
Emotional Fidelity Is About More Than Sexual Exclusivity
Marriage isn't simply an agreement about where your body sleeps.
It's an agreement about where your emotional life gradually takes root.
That doesn't mean spouses should be everything to one another.
I certainly don't believe that. Neither does Esther.
Healthy marriages need friendships.
Mentors.
Colleagues.
Communities.
People who challenge us in ways our partners cannot.
The modern expectation that one person should satisfy every intellectual, emotional, spiritual, and social need is unrealistic.
Frankly, it's exhausting.
But there is a difference between having an enriching friendship and quietly relocating the center of your emotional life.
One expands your marriage.
The other slowly competes with it.
The distinction isn't always obvious from the outside.
Usually, it's obvious on the inside.
The Conversation He Isn't Having
Here's what struck me most about his letter.
He writes beautifully about what this other woman awakens.
He writes almost nothing about whether he's tried to cultivate those same experiences with his wife.
That omission matters.
Has he ever said to his wife,
"I miss talking about books with you."
"I miss the part of us that stayed up until midnight arguing about ideas."
"I miss feeling surprised."
"I miss the version of myself that was endlessly curious."
Notice the difference.
Those are not accusations.
They're invitations.
Most couples become trapped because they complain about behavior when they're actually mourning experience.
"I wish we talked more."
Translation:
"I miss feeling mentally alive with you."
"I wish we went out more."
Translation:
"I miss discovering life together."
Those are profoundly different conversations.
Before You Leave the Marriage, Return to It
One of the tragedies of long relationships is that we often assume the marriage contains only the version we've been living.
That's rarely true.
Marriages are surprisingly renewable.
Not magically.
Not effortlessly.
But intentionally.
The couple who became experts at managing children can become beginners again in art museums.
The partners who only discuss logistics can rediscover philosophy over long walks.
The marriage that feels efficient can become curious again.
But someone has to risk asking the first unexpected question.
Someone has to interrupt the administrative meeting that many marriages gradually become.
Not with blame.
With invitation.
My Advice Would Surprise Him
If this man were sitting across from me, I wouldn't begin by telling him to stop loving this woman.
Feelings are poor listeners.
They don't disappear because we issue commands.
Instead, I would ask him to stop treating her as the exclusive doorway back to his own vitality.
Read the books.
Visit the museums.
Have the conversations.
Invite your wife into that world before deciding she cannot inhabit it.
You may discover that she has been waiting at the door all along.
And if, after honestly attempting to bring that fuller version of yourself back into the marriage, you still conclude that something essential is missing, then you'll be making that decision from reality rather than from contrast.
That's a very different place to stand.
The greatest risk isn't loving another person.
The greatest risk is allowing another person to become the sole custodian of the life that still wants to be lived inside you.
No marriage can thrive under those conditions.
Neither can you.
What Esther Gets Right—and Where I Would Go One Step Further
One of the reasons Esther Perel has influenced so many therapists is that she refuses to simplify love.
She understands that good people can have sometimes have dangerous feelings.
She understands that desire doesn't disappear because we've made a promise.
She understands that shame is rarely a good starting point for self-understanding.
On all of those points, I think she's exactly right.
Where I would take the conversation one step further is this:
I don't think the central question is whether this man is having an emotional affair.
I think the deeper question is why another human being has become the guardian of parts of himself that he no longer knows how to access alone.
That may sound like a subtle distinction.
I don't think it is.
Because if we conclude that the problem is simply "the other woman," then the solution is straightforward.
End the friendship.
Delete the emails.
Protect the marriage.
There are situations where that is absolutely the right advice. This is certainly one of them.
But if the deeper problem is that he has slowly lost touch with his own intellectual curiosity, emotional expansiveness, creativity, and capacity for wonder, then ending the friendship solves only half the problem.
The hunger remains.
Sooner or later, another remarkable person may come along and awaken exactly the same dormant parts of him.
Different face.
Same longing.
That's why therapists must be careful not to confuse the object of desire with the source of desire.
Very often, they are not the same thing.
The Marriage Isn't the Enemy
There is another temptation lurking inside letters like this:
It's the temptation to quietly put the marriage on trial.
Perhaps the marriage is too practical.
Too predictable.
Too domesticated.
Perhaps that's why he feels so alive with someone else.
Perhaps.
Or perhaps this is simply what long marriages naturally become if nobody tends the inner lives of the people inside them.
Children require attention.
Careers require attention.
Parents require attention.
Health requires attention.
Mortgages require attention.
Almost everything in adult life demands maintenance.
Curiosity does not.
Wonder does not.
Play does not.
They simply fade if we stop feeding them.
Then, years later, we mistake their absence for evidence that we married the wrong person.
Sometimes we didn't marry the wrong person.
Sometimes we abandoned the wrong parts of ourselves.
The Best Question in Couples Therapy
After years of sitting with couples, I've become less interested in asking:
"Who is right?"
or
"Who crossed the line?"
I'm more interested in asking:
"What disappeared?"
When did admiration disappear?
When did surprise disappear?
When did laughter become occasional instead of ordinary?
When did the conversation narrow until it consisted entirely of logistics?
And perhaps most importantly:
Who were you becoming together before life became so busy that you stopped becoming at all?
Those questions don't excuse betrayal.
But they often reveal the landscape in which betrayal becomes imaginable.
Love Is Not the Only Thing That Needs Protecting
We spend enormous energy protecting marriages.
As well we should.
But marriages are not sustained by loyalty alone.
They are sustained by two life partners who continue bringing living, growing, curious selves home to one another.
That's the part we often forget.
This man's letter isn't only about temptation.
It's about vitality.
It's about the quiet fear that somewhere along the way, he misplaced a version of himself that once felt awake.
Another woman happened to remind him.
His task now is not to possess the reminder.
His task is to reclaim the person being reminded.
If he can do that, something remarkable becomes possible.
The other woman no longer has to carry the weight of his unlived life.
His wife no longer has to compete with an idealized possibility.
And he no longer has to choose between two women in order to recover himself.
That's the ending I would hope for.
Not because it guarantees the absence of longing.
But because it transforms longing from a threat to the marriage into an invitation to become more fully alive within it.
And in the end, I think that's the work of every good marriage—not to eliminate the possibility of longing, but to create a relationship spacious enough that each partner can keep discovering new rooms inside themselves, and generous enough that they invite the other person in to explore them together.
Frequently Asked Questions
Can you love your spouse and still develop feelings for someone else?
Yes.
Long-term commitment doesn't eliminate your capacity to admire, desire, or connect deeply with another human being. Marriage governs our behavior far more than it governs our imagination.
The better question isn't "How could this happen?"
It's "What is this attraction asking me to notice about my life, my marriage, or myself?"
Feelings are information. What you do with them is character.
Does having a crush mean my marriage is in trouble?
Not necessarily.
Sometimes a crush reflects genuine problems in a marriage.
Sometimes it reflects a neglected part of your own identity.
Sometimes it's simply the exhilarating experience of meeting someone who reminds you that you're still capable of feeling alive.
A crush is a beginning—not a conclusion.
The mistake is assuming it tells you exactly what to do before you've understood why it's happening.
What is an emotional affair?
An emotional affair isn't defined by a single conversation or even by attraction.
It develops when another person gradually becomes your primary source of emotional comfort, excitement, validation, or psychological intimacy.
Ask yourself:
Who is the first person you want to tell good news to?
Who understands your inner life best?
Whose opinion matters most?
Who occupies your thoughts when you're emotionally vulnerable?
When those answers begin shifting away from your spouse, something important deserves your attention.
Is emotional infidelity always intentional?
Rarely.
Most emotional affairs don't begin with seduction.
They begin with conversation.
Shared interests.
Mutual admiration.
A project at work.
A friendship.
A sense of being deeply understood.
That's precisely why they can be so difficult to recognize.
People usually don't wake up intending to betray their marriage.
They simply fail to notice where their emotional life has quietly migrated.
Why do I feel more like myself around another person?
This may be the most important question in the entire discussion.
Sometimes another person doesn't create a better version of you.
They reveal one.
Perhaps you're more playful.
More intellectually curious.
More creative.
More emotionally expressive.
Instead of asking, "Do I belong with this person?"
Try asking:
"Why have I stopped living this part of my life everywhere else?"
That question often changes everything.
How do I know if I'm in love with the person—or with the possibility?
Ask yourself a difficult question:
How much of your relationship exists in ordinary life?
Have you navigated disappointment together?
Conflict?
Money?
Illness?
Family obligations?
Laundry?
Most impossible relationships remain protected from reality.
They're not necessarily false.
They're simply incomplete.
Possibility is intoxicating precisely because it has never had to survive Tuesday afternoon.
Should I tell my spouse?
There isn't a universal answer.
Confession can deepen intimacy.
It can also transfer your emotional burden onto your partner before you've understood it yourself.
Before you disclose your feelings, ask yourself:
What am I hoping this conversation will accomplish?
Am I seeking closeness—or simply relief from guilt?
Those are very different motivations.
When in doubt, discussing your feelings first with an experienced couples therapist can help clarify the wisest path forward.
Should I end the friendship?
Most likely. I’m pretty stern on vague friendships with attractive others.
But don't confuse removing them with resolving the problem.
If this friendship has become emotionally exclusive, secretive, or has displaced your connection with your spouse, creating distance is often appropriate.
But if you've outsourced your curiosity, vitality, or sense of aliveness to another person, ending the friendship without reclaiming those parts of yourself simply leaves the underlying hunger untouched.
Different person.
Same longing.
Why do impossible relationships feel so profound?
Because imagination edits reality.
The relationship that never had to survive bills, fatigue, aging parents, or years of accumulated disappointment can remain permanently illuminated by possibility.
Real marriages earn their beauty through endurance.
Imagined relationships borrow theirs from mystery.
Both feelings can be genuine.
Only one has been tested.
Can a marriage become emotionally alive again?
Absolutely.
One of the greatest myths about long-term relationships is that emotional vitality inevitably fades with time.
In reality, it usually fades because curiosity fades.
Partners become experts at running a household while forgetting how to keep discovering one another.
Healthy marriages continue asking new questions.
They cultivate shared adventures.
They make room for surprise.
Psychological intimacy isn't something you find once.
It's something you continue creating.
What is the single most important question to ask if I develop feelings for someone else?
Not:
"How do I stop thinking about this person?"
Instead ask;
"What part of myself only seems to come alive in their presence—and how can I bring that part of myself home?"
That question shifts the focus from temptation to transformation.
And that's where real growth begins.
When should we consider couples therapy?
You don't need to wait until trust has been broken.
Couples therapy can be invaluable when:
Your relationship has become more logistical than intimate.
You feel emotionally lonely despite loving one another.
One or both partners are developing an attachment outside the marriage.
Curiosity, admiration, or playfulness have faded.
You find yourselves having the same arguments without resolution.
You want to strengthen your relationship before a crisis forces the issue.
The healthiest couples aren't the ones who never struggle.
They're the ones who become curious before they become desperate.
Final Thoughts
If this essay made you uncomfortable, you're in good company.
Most thoughtful people will, at some point in a long relationship, find themselves wondering what a particular person seems to awaken in them.
That question doesn't make you disloyal. It just makes you human.
The important question isn't whether you've noticed someone else.
It's what you're going to do with that awareness.
Will you quietly feed a fantasy?
Will you bury the feelings and hope they disappear?
Or will you become curious enough to ask what your longing is trying to teach you about your marriage—and about yourself?
Those are conversations worth having. They're also conversations that are often difficult to have alone.
If you and your partner have begun living more like capable co-managers than curious companions, if you've lost the sense of discovery that once defined your relationship, or if you're struggling to make sense of feelings that don't fit neatly into right and wrong, science-based couples therapy can provide a place to explore those questions honestly, thoughtfully, and without shame.
The goal isn't simply to prevent an affair.
It's to build a marriage that remains psychologically alive.
If that's the kind of work you're ready to do, I'd be honored to help.
When you’re ready, let's begin the conversation.
Be Well. Stay Kind. And Godspeed.