I would agree to the separation and save up some money for a down payment on my own car and put the money I've been paying toward "his" car toward it. Separate and get your act together for the divorce; get a good lawyer and some money saved, etc. Put your anger at his ugly behavior to good use? Get what money you can from him during the separation and make a plan. I wouldn't stay with such a man any longer than I had to.

You don't have a good friend or coworker who could get you to/from work? Get a lawyer!