Why not just go no contact right now? He is breaking the rules having a phone and texting in the middle of the night...I guarantee it, so isn't dedicated to his recovery or he would mind the rules. If he isn't willing to do what he needs to do to find and keep recovery, he will end up in the revolving door or recovery/relapse, just like my son did.
This might be a good time for you to work on your own recovery, taking time to find your balance and decide what attracts you to a person who actively uses drugs and cheats on you. You are worth so much better than that.
Good luck.
Hugs