sorry you're going through this.
As others have said: there is no a right thing you can do for him. Many of us have tried to do any single thing you can think of, any single approach, it doesn't work, it doesn't make a differnce, all it does is it enamshes you deeper into the madness of alcoholic life. He wins nothing and you lose so much.
All you can do is take care of yourself, protect yourself and let him fight his own battles (acctually that is the only helpful thing you can do for him).
It took me an awfuly long time to realize that, hope you get it faster.
Take care