first off I have to say YOU cannot DEVELOPE a support system for HIM.
There are already alot of support systems out there that HE needs to get into.
second, addicts are always really great at portraying the VICTIM, it's how they get you to keep giving them chances. if I were to give you advice on this one it would be to tell him you don't feel bad for him anymore, that unless he wants to get BETTER, he can have the pity party all by himself.
I am saying this with nothing but love.
so many times I've seen it written, "nothing changes if nothing changes"
so if he doesn't do something to change it won't.
now on to you, no need to live in panic, go about your business and be yourself. eventually he'll see that he doesn't have you to bounce crap off of.
and perhaps you will want to leave, and if that time does come you will know you did what you could, because you didn't cause it, you can't cure it and you sure can't control it.
best of luck to you and keep reading here, this place has saved my sanity.