I am reading your post, but as the spouse on the other side of drug use, I don't know if I can begin to be objective. I can tell you a little of how I felt and what would have worked for me.
Firstly, you can stop using drugs. I know I got really tired of hearing words like relapse, slip or anything else that tried to make it any less than a conscious decision. Denials infuriated me. I had no trust after awhile. It is my belief that liars, lie. So, if he lied about drug use, he was willing to lie about other things.

I am wondering how many promises you have broken. So, a first step could be to get the focus on YOU and your issues. Let him actually see you doing something different. Let him see you be and adult, accept responsibility and make a decision to do things differently. I think if at any point if he had said that he was sorry, knew he was a druggie and was actually going to rehab, I would not have asked him to leave.

I would suggest you read the books, get yourself to some meetings if that if the route you are going to take and just work on yourself. Trust takes a long time to build again.


Arguing with reality is like trying to teach a cat to bark—hopeless. (Byron Katie)