He did not know any of it, because in the two days it took his mother to die and be laid to rest, my husband had not once picked up his phone.

And he had no idea at all that on the dining room table of the house we had shared for twenty years, I had placed my platinum wedding band, flat, directly on top of a legal folder containing a petition for divorce.

I want to be honest that I did not arrive at that folder in a fit of grief-stricken rage.

It would be a cleaner story if I had — if the sound of that giggle behind his voice had shattered something in an instant and sent me straight to a lawyer.

But that is not how twenty years of endurance ends.

It ends the way a rope ends, fiber by fiber, over a very long time, until one ordinary day the last thread parts and the thing holding an enormous weight lets go.

The giggle did not break me.

The giggle was only the last fiber.

The weight had been coming down for years, and I had been the rope.

People who leave difficult marriages are always asked the same question, in one form or another: why now?

Why, after all this time, after so much worse, did this particular thing finally do it?

And there is never a satisfying answer, because the question misunderstands how endurance actually works.

The thing that finally makes you leave is almost never the worst thing.

It is rarely even a bad thing, by the standards of what you have already survived.