Thank you for your reply :-)
I guess my problem lies in my codependency and ability to be manipulated so easily by him. He's pointed out to me before that I was "lucky" to get into rehab, and isn't shy about pointing out the fact that he stayed with me while I was active in my addiction. I have this overwhelming sense of obligation to help him... I've gone to meetings with him and introduced him to people, and left him on his own afterwards so he can mingle and hopefully find a sponsor.
Can a drug addict truly get and stay sober without rehab?