So, what's the issue of allowing you to use his car if he's not going on interviews or looking for work? I thought his credit card was tapped out? All of sudden he's got money for a rental car? That doesn't make sense unless you have that feature added on your car insurance.
He's a very stubborn one. It could be a while longer with him.
Keep praying for him.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.