I assumed people would notice. I’d been behaving weirdly, walking around in a bit of a daze – I could sense that much, even if I was unable to actually snap out of it. I thought someone would have worked out why, would have taken me aside and said, “I know that look – what’s her name?” like they do on television. But nobody did, so it just went on. I gradually returned to normal, eventually lost interest. At some point I realised she was never on the train anymore, she must have moved away or changed jobs or something but I didn’t notice it happen. By then I was back to normal, cosy nights in with the wife, forgetting my head had ever been turned.