If you are asking if you should move in with him (have no idea what dv is), then the answer is no. You cannot protect him or control him. If he takes meds for bipolar, then good for him. But you combine the bipolar meds with marijuana and you've got a hot mess on your hands.
No way should you allow a child of yours to be around this toxic situation and you sure don't want to get busted with drugs in your home with a child around. So my answer is - no. No way. I'm not putting my child at risk for any man.