I don't know the whys and wherefores, but maybe the drinking did make him neglectful enough that the ex finally had enough. Making her cheat, are those her words or his interpretation?
It's bit of both. I was really close friends with her until I moved in here and she broke off the friendship. I've always felt that she has some kind of victim complex. I saw her a while after they split up and she said that the reason HM is taking the breakup so hard is because he knows it's his fault. I also told her that someone we both knew had been diagnosed with cancer and her immediate response was 'she deleted me on facebook'.
I used to hang out with them a lot when they were together and I even went on holiday with them 2 years ago. From what I saw, he certainly wasn't neglectful. She just won't accept responsibility for things. She slept with this other guy a couple of times before she left. When she told me about the second time, she said that HM had started an argument and was really having a go at her so she left the house and drove around till she ended up at the other guys house. I asked HM about this and he told me the full story. The two of them had had a big heart to heart conversation about their relationship and what they wanted. He went to the bathroom and when he came back she had received a text from the other guy asking if she was alright. She was in the middle of replying 'No, I'm only alright when I'm with you'.
CaptainStoner - Apology accepted. I understand where you are coming from and I do appreciate your view point on this. And I will go home if I need to.
Kestra - I do understand that I have no control over his behaviour and I know that things won't suddenly change. It will take time. If he actually starts doing something about this, then I'm here for the long haul and will support him. He actually said a while ago that he's fed up of people saying stuff about his drinking so I'm not sure how to go about making him realise it is a problem without having him close off and ignore what I'm saying to him.