He had an affair with Amanda, it was confirmed by Popbitch who are pretty reliable.
He she had an eating disorder from a young age. She had issues before she was famous. Cant help but feel sorry for what happened to herI think he was a massive cause of Amy's problems. Obviously her husband didn't help as regards drink and drugs, but I think her problems were there long before she met her husband and a lot of them were caused by her father.
Back to Black was supposed to be about her relationship with Blake Fielder Civil, but I remember reading somewhere that it was actually supposed to be about her father leaving her and her mother for another woman and how much it destroyed her.