I don't blame you for feeling the way you do. He doesn't seem to have alot of respect for your feelings right now. I also agree 6+ months clean is no one to sponsor anyone else in fact it is discouraged. It is also discouraged to sponsor someone of the opposet sex. It sounds like he is getting his ego fed by these girls.
It's a good sign though that he is asking you to come to the meetings with him, I would keep going and talk more with these girls, it could just be immaturity on there part by not knowing better and if he is not discouraging them they will continue.
I also am wondering why he is not working? What is that all about?