I agree with all the other posts, he's going through a normal 'bargaining' process of the genuine A, which is convincing themselves that now it's under control they can drink in moderation. As we all know, it almost never works. It takes far more will-power to drink moderately than to be completely abstinent.
In your situation you should be aware that he may have a long time ahead of him before he finally gets it, if he ever does. You'll be on the roller-coaster, clinging onto hope, followed by disappointment. Only you can decide how much of this process you can take.
Maybe share with him how much you've loved having him back for the last few months of sobriety, and how you'd like that to continue. At least he'll be aware of how you feel. It might not stop him, but you've laid it out him and he can't say he didn't know.