I told Mum to tell Mark I was out if he rang, which he did – the next day. He didn’t leave a message.

Ignoring his calls was torture. I nearly caved in several times but I ripped up the letters I’d spent for ever composing before I could send them. Then he turned up at my door.

‘I thought about bringing flowers or wine or something but you’re worth more than that, Claire. Please,’ he added before I could respond, ‘just hear me out. You can tell me to fuck off after I’ve said what I need to say. Can we go to the pub? We can sit outside if you want.’

I listened for an hour as he explained how he’d struggled academically at school after his mum died, going in during the holidays for extra help with his coursework and scraping five low-grade GCSEs. He told me how his dad had said he’d never amount to anything and his best bet was to join him in the family’s building-supplies firm so he could learn about running a business. His dad had laughed when he’d told him he didn’t want to do that – he wanted to be a policeman – and had called him a grass. Two of Mark’s uncles were in prison, one for aggravated assault and one for fraud, and he knew his own dad wasn’t beyond taking a few backhanders and passing on stolen goods.

‘I wanted to better myself,’ Mark told me. ‘Everyone on our estate thinks my family is dodgy. People cross the street when they see me out with my uncle Simon. The family thinks it’s respect but it’s not, it’s fear, and I don’t want that kind of life for me and my kids. Because I want kids, you know, Claire. I want a family.’

Kids. His eyes shone as he said the word, just as they had when he’d talked to me about joining the police.

‘I want to be respected. I want people to look up to me because I’ve achieved something.’

And then he told me about what he called the ‘boxes’ in his head. It was his way of compartmentalizing his life. He couldn’t get in touch with me after he’d been rejected by the police because he was trapped in that box in his head. He had to process what had happened, then shut the box and get back on with his life. If he’d rung me he’d have taken a lot of his anger and resentment out on me and he didn’t want that. He didn’t want me to see him at his lowest.

‘If you’d seen me like that you’d have lost all respect for me. I’d have lost you.’

‘Maybe you already have?’