How can it be, I wondered, that we can be lying in bed next to a person we love wholly and helplessly, a person we love more than our own breath, and still ache to think of the one who caused us pain all those years ago? It's the betrayal of this second heart of ours, its flesh tied off like a fingertip twined tightly round with a single hair, blue-tinged from lack of blood. The shameful squeeze of it.

It's true, isn't it, that each of us has two hearts? The secret heart, curled behind like a fist, living gnarled and shrunken beneath the plain, open one we use every day.

All this to say: I am forty-three years old. I may yet live another forty. What do I do with those years? How do I fill them without Lexy? When I come to tell the story of my life, there will be a line, creased and blurred and soft with age, where she stops. If I win the lottery, if I father a child, if I lose the use of my legs, it will be after she has finished knowing me. "When I get to Heaven", my grandmother used to say, widowed at thirty-nine, "your grandfather won't even recognize me.

I remember my wife in white.' It just made people weep to hear it...Everybody just thought it was the saddest sentence that was ever written. And it didn't matter if I never wrote another word. This one sentence had put an end to the need for any future sentences. I had said it all.

I can't take one breath, not one single breath, without knowing that I love you.

How can it be, I wondered, that we can be lying in bed next to a person we love wholly and helplessly, a person we love more than our own breath, and still ache to think of the one who caused us pain all those years ago? It's the betrayal of this second heart of ours, its flesh tied off like a fingertip twined tightly round with a single hair, blue-tinged from lack of blood. The shameful squeeze of it.

The conclusion I have reached is that, above all, dogs are witnesses.