"He is now sober...."
He isn't sober.
He is "dry".
Sobriety implies he is taking the steps necessary to help himself, and getting the help that he needs to stay off drugs.
Right now he's just "dry"....until he gets more pills.
He is not able to manage his addiction on his own, and you are not able to manage his addiction either.
Until you both come to realize this,
which is the hardest step ( you are powerless )...
history will keep repeating itself.
Good you are here with us at SR.