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.

Had I known but yesterday what I know today, I’d have taken out your two grey eyes and put in eyes of clay. And had I known but yesterday you’d be no more my own, I’d have taken out your heart of flesh and put in one of stone.

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.

There would be hard times, but what did I care if we had hard times? The branches of my love were wide, and they caught the rain and the snow. We would be okay, the two of us together. We would be okay.

It was September, and there was a crackly feeling to the air. I was saying something that was making her laugh, and I couldn't stop looking at her. It was a little bit chilly, and her cheeks were pink, and her dark hair was flowing around her face. All I wanted for the rest of my life was to keep making her laugh like that. Sometimes our arms brushed against each other as we walked, and it was like I could feel the touch for minutes after it happened.

The conclusion I have reached is that, above all, dogs are witnesses. They are allowed access to our most private moments. They are there when we think we are alone. Think of what they could tell us. They sit on the laps of presidents. They see acts of love and violence, quarrels and feuds, and the secret play of children. If they could tell us everything they have seen, all of the gaps of our lives would stitch themselves together.

Because for most of us, suicide is a moment we'll never choose. It's only for people like Lexy, who know they might choose eventually, who believe they have a choice to make.