Is he seeing a therapist as well? It sounds like he might need help with alcohol as well as needing relationship therapy. Personally I think that would be a better first step. He needs to learn how to be supportive and if he just can't come around, then would be the time to consider leaving.

Also, there are some red flags here. I read the OP three times and there seem to be some things that sound almost like emotional abuse, but I can't be sure. Am I correct about this? If so, ignore everything I said and get out.