From what I have been told, he should quit for HIM and him only.
I'm glad he is going to AA now.
You really should go to Alanon. I think it would really help you a lot.
One thing they teach is to detach w/love. Also, your feelings don't have to hinge on the alcoholic's every move, like them relapsing, etc.
It sounds really tough I know, but learing some of those things can save you some energy.