My best advice, because I have been where you are, is to cool off the relationship.
He needs to go get sober again and honestly there is nothing you can do that will help him. He needs to go to the meetings, get back to work on his program and build a sober foundation.
Move on. He has lied, you can't trust him and to be honest he can't trust himself right now. You did not cause it, you can't control it and you can't cure it.
This is HIS problem, let him deal with it.