I hate to say this but he has to do his own thing. What happens if this uncaring person is really what he is. YOu have to help yourself and get on with your life. YOur have an addication and that is trying to control your partner. You are lucky that he can call and have a cell phone. Must rehab places will not allow that. Let him do his recovery if you keep pushing him you could push him away. As for the sex are you really that selfish. At least he is coming home on the weekends and not out drugging.
I am both a Recovering Addict and have a husband that is a trying to recover but he does not want it yet. So I had to let go and move on.
If you do not like what he is doing on the weekend then do not have him come home. He can not control what you do or do not do. He does not control your feelings, you let him control you.
YOu need to get help for yourself and your daughter. Have you thought what happens if after that year you do not like this man. Are you going to stay with him.