The quiet erosion.

When marriages end after twenty years, the people inside them almost never identify a single cause. They describe weather, not events. We slowly stopped knowing each other. It felt like we were roommates running a logistics company. I missed him while he was in the next room, and I stopped knowing how to say it.

Drift is the most common cause of death in long marriages, and it is almost completely invisible while it is happening.

How drift looks from the inside.

Drift does not feel like crisis. It feels like competence. The household runs. The kids are managed. The schedule is honored. Birthdays are remembered. From the outside — and often from the inside — nothing is wrong. There are no big fights. Sometimes there are actually fewer fights than there used to be. That apparent peace is part of what makes drift so hard to name. Couples often mistake the quiet for okay-ness.

What is actually happening underneath is a slow withdrawal of attention. The small turns toward each other — the look up when the other walks in the room, the unprompted touch in the kitchen, the question about how a meeting went and the real listening to the answer — these get crowded out by the legitimate demands of an adult life. Nobody decides to stop. Everybody is just very tired.

Small moments of disconnection.

Try this: think of the last small thing your partner said in the last few days that could have gone either way. A comment about the weather. A sigh at the mail. A story about someone at work you have not thought about in a year. Did you turn toward it — even a beat of attention — or did you nod without looking up?

This is not a test. It is what daily life is. But it adds up. Over a year that is a few hundred small misses. Over a decade it is a body of evidence the under-mind has been quietly tallying: I am alone in here. It does not matter that you love him. What matters is that his last five bids landed in a silent room.

The math of missed repair attempts.

John Gottman's research on long marriages found that the thing that most reliably distinguishes couples who stay close from couples who drift is not how often they fight. It is what happens in the seconds after a rupture. Do they reach for each other, however clumsily? Does one of them make a small joke, a look, a touch, an olive branch? Do the others receive it?

Couples who make and receive small repairs, over and over, stay connected through decades of hard weather. Couples who miss those repairs — who let the small ruptures compound because they were tired, or busy, or waiting for the other to move first — slowly drift, whether or not they ever have a single big fight.

The repair attempts do not have to be graceful. They almost never are. What matters is that one of you tries, and the other one lets it in.

Parenting, work, and the seasons that make drift easy.

Certain seasons of life are drift-heavy by design. The early parenting years, when survival requires that the relationship go to the back burner. The demanding-career years, when both of you are giving your best selves to people who are not each other. The teenagers-are-hard year. The sick-parent year. The moving-house year. The both-in-therapy-separately year.

None of these are moral failures. They are life. What matters is the awareness that these are the seasons in which drift accelerates, and the deliberate choice to protect at least a little bit of the relationship even when everything else says you cannot spare it.

This is why so many couples arrive in therapy the year the youngest kid goes to college. Suddenly the shared job is done. They look up. They realize they have been running a household together for fifteen years and know less about each other than they did when the household began.

The hardest part: it is plausible.

What makes drift uniquely painful to talk about is that nobody is doing anything wrong. The reasons your partner did not notice you for weeks are real — a sick parent, a big quarter, a child in crisis, his own depression. The reasons you stopped reaching are also real. You are not crazy for being lonely. You are also not entitled to be angry at someone for missing bids you never named.

This is why drifted couples often arrive in therapy bewildered. They are not fighting. They love each other. They cannot point to a villain. And they are slowly, plausibly, dying as a couple.

How drift becomes repair.

The good news, and it is real news, is that drift responds to attention faster than almost anything else in a marriage. It is not the years that killed it. It is the inattention. The years, on their own, do not do much. Two months of intentional turning-toward can start to reverse what a decade of missing built.

The repair for drift is almost embarrassingly small, and almost no one can do it consistently without help. It is, mostly, putting attention back into the relationship the way you used to. Asking questions you would think you already know the answer to. Touching for no reason. Saying the soft thing instead of the efficient thing. Letting the partner you have actually surprise you, instead of relating to the partner you assume he has become.

What therapy adds.

In therapy, this looks like slowing both of you down enough to start noticing the bids that have been getting missed, and to start risking new ones. The first few are awkward. The first time a husband who has not been emotionally reached for in a year turns toward his wife and answers her, something in the room changes. They both feel it. From there, it is reps. Not grand gestures. Reps.

This is one of the most hopeful kinds of couples work I do. Drifted couples are not broken couples. They are couples who never stopped loving each other and simply stopped tending to it. When they start tending again, love does what love does — it comes back into the room.

Long love does not require a second honeymoon. It requires putting your eyes back on the person you married — and discovering, often with grief and relief, that they have been waiting for you to look up.