I would try to contact some advocate mental health place and explain your problem to them and acknowledge he is beyond your help even though you love him dearly. I would warn them he is extremely smart and he is a difficult case. He really sounds as if he needs to be put into a strict problem until he gains some insight into the trouble he is creating for himself and how you can't bail him out. I know it is very painful to realize you can't help him but you can help him by seeking help for him from people who are experienced and don't carry the emotional feelings you have for him
bobby