The best thing you and his mama can do to help him is to stop helping him. Let him handle his problems by himself. He needs to learn to face life on life's terms and solve his own problems. His sobriety and recovery are his responsibility.
One huge regret I have about my ex is all the time and energy I wasted trying to clean up his messes and solve his (often self-created) problems for him. We both would have been better off if I had stepped back and let him handle his own stuff and had handled my own as well.
Another regret I have is that I waited so long to start going to Alanon. Your bf has been in AA. Have you and his mom tried Alanon? It has made a world of difference in my life. Good luck.