You can't fix him. Only he can fix himself.
He's a grown man, and if he's been in rehab several times then he has been given the tools to do what he needs to do. He knows he can walk into an AA meeting, walk into the Salvation Army, etc. He knows these things, but he doesn't do them because #1 he doesn't have to, you keep bailing him out and making it easy for him to continue down this path #2 he isn't ready to do what you think he needs to do.
Get on with your life lettc, and allow him the dignity of living his own - somewhere outside of your apartment of course.
Big hugs to you, I know it's so hard. But you simply cannot fix him and trying to will only destroy you also.