Yay Chicory!
Thumper and Pelican could not have said it better. Hang tough! Chances are, the more grief he tries to give you about not enabling him, the better job you are doing. He'll need to release that frustration somehow, and addicts/alcoholics never have a very good sense of logic, which is why his frustrations will probably be pointed at you, instead of at himself. Keep putting your foot down.
Great work! We're here if you need us!