The relationship you have is one of parent/ child, not of equals. Him wanting you to make most, if not all, the decisions is proof of that. Classic passive / aggressive. You decide so i can be both irresponsible and critical.

Why does he behave this way? Because you allow it.

The question should be why do you allow him to do this? You wouldn't be playing your part unless you were getting a pay off. What are you getting out of this?

Whether he goes to meeting or calls his sponsor is irrelevant. His drinking is his problem. You are powerless over him and his behaviour. Unless you want to spend the rest of your life being the "warden" and keeping him in check, you have to let go.

Find an Al-Anon meeting and go. At least go online and read the literature.

Alcohol may be his drink. But i fear he has become your drink.