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.

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.

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.

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.

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.

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.

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.