If you're worried that he may not survive outside the marriage, your worry is well-founded. In it, or outside it, he is self-destructing. You can choose to continue having a ruined life, so that he self-destructs in the comfort of your home. That would be foolish of you. Society has resources for persons like him. When he applies for them, he will be told there are rules he must follow. They will enforce that. That might force some change. Just understand you're never going to get him back, "fixed."