Maybe it might be better if he went to a Sober Living House for a few more months where he will not only be with others in recovery but have a very great opportunity to start learning how to use those 'tools' that the rehab gave him.
You do not have to let him back into the house at this time. You can wait and see if his ACTIONS show he is working a program of recovery.
And that will also give you some time to work on you.
J M H O
Love and hugs,