Remember the cliche that you cannot change people. Its a cliche because its true. You may tell him the things you want to see (him making changes) and just because he may try them for a while, doesn't mean he's changing anything. Lynn's advice is really spot on, regardless of what you decide, you shouldn't live together right now.

And all that crap with him saying how dumb he is is done completely out of manipulation. He knows you like to help people and he's going to play off of that.