He has not been sober for 2 months, he has been using drugs. It doesn't matter what they use, using is using. Addicts often switch their DOC. He is not in recovery, he is an active user.
Get yourself to meetings, read Codependent No More, the stickeys at the top of this forum and cynical one's blogs, lots of helpful information at your fingertips. Work on you, learn all you can about addiction, codependency and bounderies.
Sending support your way.