Becoming a social or "normal" drinker is simply not possible for an alcoholic, and it gets nothing but worse over time. The only way things can improve is if he choses to do it himself, and it sounds like he has absolutely no desire to do so.
You know the right thing to do with leaving, he doesn't control you. I would speak with an attorney about getting divorce or at a minimum a legal separation going, as well as looking for a new place to stay. You don't want to waste your life away on this nonsense.