Have you tried meetings and working a recovery program for yourself? Coming here is one good way to heal, but you would find working the steps with a sponsor a process that will help you with all aspects of your life, including finding your balance again here.
I sometimes feel like I am throwing "get to a meeting" at people, but the truth is, it's been a lifesaver for many of us, I know it was for me.
Rehab gives him tools to deal with life without drugs. It doesn't promise to make him a terrific partner, that's up to him and you. Sometimes damage can be mended, sometimes it cannot. Only you can decide if he is bringing as much as you are to your relationship and if this is how you want to live.
Hugs