I know how you are feeling. My boyfriend is just in a 4-8 week (or more if he needs it) rehab program, and I can still see him and talk to him. But the thought of living alone and not having him here for the day to day stuff is making me crazy sometimes. I know that he has made the right decision and am so proud of him for doing the right thing. It seems like he really does want to get clean this time. But I can't help thinking how lonely I am without him around (I don't have friends and family where I live now). I just have to keep telling myself that this is what is best for him.
I don't have any words of wisdom for you. Just want you to know that you are not alone in feeling how you feel. Everyone here at SR is great, and hopefully you can find some solace here.
Have you attended any Alanon or Naranon meetings? I never have but am planning on going to my first one this Saturday. Maybe it would help you.