Hmmmm. I don't really have enough information on your situation but my first answer would be they build a lot of resentment towards you. An active alcoholic doesn't process things like we do - if you say the wrong thing or do something they don't like, they let it build and fester and create a lot of resentment. Or they are very focused on someone else so that they don't have to focus on themselves. Or they just like to fight and create drama so they have reasons to drink.
It's hard to make sense of crazy - but so far these are the things I have learned here.