Well yeah because if you move he's not going to go with you if he feels like that about her. You are going to have to try to find a way to trick him out of the house.

Call the cops and tell them he's been talking about hurting himself and having Baker acted for a few days. He won't be arrested, he'll only have to go stay at a psych ward for 3 days, and hopefully away from her, and see if things change.