Stay safe and let us know how things are going. He has to want to get help and change. If he doesn't and he's dangerous and/or cruel, it's in your best interest to stay away. Don't worry about what he may or may not be doing. (Easier said than done.) I think he'll get curious eventually as to why you're staying away, especially if he swings down. At that point you can make some conditions about coming back.
Sorry I can't tell you anything else. You might want to make an appt with a therapist yourself to talk about all you're dealing with. He or she might have some insights and other ideas about how to best deal with the situation or a person with his history and diagnosis.