You are not ignoring him, Mambo, the depth of your concern is apparent to anyone reading your post. The journey he is on is one that you cannot take for him. He has to move through this on his own. You can't do it for him. No one can. Sounds like you have a really good sponsor, and she is right. Give him a lift to rehab if he ever wants to go.
It's only human to worry about the people we love. We just have to be careful not to let it so consume us that we stop living our own life--something I struggle with regularly. I know that I am a better person to all the people in my life when I truly love my own day (life) and all that is in it, without clouding the day with worry that, for me, never seems to accomplish or change anything.
You must be an incredibly caring person. I hope you send some of that care toward yourself this weekend. Take care of (((you)))