I hate to say, if he was not getting anything out of it he may as well leave. Hopefully he can try to find an alternative. As far as telling him to go to his moms...GOOD FOR YOU! The worse thing I could have ever done was let my husband come home right after rehab, and he did finish the 28 days there. I wish I would have waited for at least a year, maybe more. Maybe never, I don't know. That is beside the fact.
I just wanted to say I feel for you and what you are going through and think it is admirable of you to tell him to go to his moms! Stick to YOUR boundaries and work on you!