I have read your sitch and I think you're letting negativity get to you. It's easy to second guess when we're in fragile situations like this, but this is insecurity.
When you think up some negative reason why he doesn't want to be with you, that is your imagination, not something that he's definitely thinking.
Just be as positive as possible and it will affect him and others around you, and be prepared to make more allowances for his mood, given that he is still coming off drugs.
