Great post Lila. Focus on your life and your goals. Let him focus on his life and his goals.
Set boundaries about the kind of behavior you expect from the people you surround yourself with based on what is important to you. Start young. :-) It makes life easier as you get older. You'll be a lot farther along at 40 than I am, if you start now.
I hope you keep reading and posting. The people here are very supportive and knowlegeable about life with addicts.