I am so sorry you are going through this. I know how hard it must be. Honestly, I would let him have his space. He is likely going through a big transition in his life, and (hopefully!) focusing on his recovery. Recovery should come before anything else. If he has a sponsor or any type of counseling going on, they will also encourage that his recovery come before his relationships or other aspects of his life. Try not to take it too personally. He very likely appreciates that you were there for him through his unlovable moments, but really does need the time to focus on him, now.
If it's the other way though, where he is snubbing you over drugs and he is still using, then definitely let him have his space. Care for him from afar. I know how hard that is, but you really can't offer him any type of constructive support if he is not trying to get clean.
Unfortunately, that is the risk you run loving an addict, you honestly never know what you are going to get in return. ):
Hoping for easier times soon. Hugs.