FF, he's lucky to have a good friend like you. However, you need to end this immediately. Your kindness is enabling his drug use. He must hit bottom (it sounds like he's pretty darned close) and decide on his own that he needs help. Nobody can help him. He must help himself. He will lie, steal and cheat to get drugs. He will sell his own mother. He has no conscience right now. Your friend no longer exists, only an addict. Once he's clean and sober, your friend may come back to you. You must have faith.