This is what he is doing, they are both addicts and his connection with her is in "getting high". You can't even fix this, this is something HE has to change and he is showing he STILL wants to use drugs and escape and she wants that too.

When in a relationship with an addict, whether the person is engaging the addiction or engaging in staying clean and sober, THAT challenge is ALWAYS a precedent in the relationship.

I do not recommend someone having a relationship with someone with this problem. It can get LONELY. The only time it works better is if both individuals are living their lives working on staying sober as then it becomes something they do together.