Glad you found us, welcome.
I personally do not believe that you should use one chemical solution in an attempt to fix a problem from another chemical issue.
The fact he does not want to attend AA and only see a therapist should be setting off your radar with warnings. Not saying AA is the only program to help support sobriety but it's one of the biggest and if he's shying away from that, he probably has other plans or is not fully ready to truly quit.
With that being said, your focus should be one you to get yourself independent of this relationship and not defined by it. Al-anon would be good, therapy, counseling anything you can do for you that does not relate to him.