Being "willing" to get help (saying he is) and doing it are two different things. I'd wait until he actually starts working on his problems in earnest and made some progress before I got back with him. Have you all started couples therapy or anything?

I didn't quite understand why he took your keys/what the argument was about? You weren't drinking or anything were you and unsafe yourself? My husband hit my arm once but I was trying to electrocute us :-) and had just enough control of myself (my stepmother use to abuse me) to stop and ask him "why?" and he gave a very good answer and I realized I had been acting dangerously and it had been very necessary for him to hit my arm away from the controls.