How should i handle this?

My husband sold his car out of no where. He told me once he did it saying it was an opportunity he couldnt pass up. His payment was 800$ a month plus 400$ for insurance and expensive gas maybe 100+ a month and 150$ parking. I said but you love your car and he said he is a simple man and can take a bus. He only had 2 yrs left to pay on it. He said he needed a break for those high payments. Our lives are very separated, our finances are separated. He is retired and i work for myself. Im up at crazy hours of the night working. He doesnt ever help me with any payments. For the first time he is talking about helping me with rent and just being able to help since he wont have this high payment. I have a car and my payments are not as high but it’s still a struggle for me because I’m still working and working for myself at that. Today is the first day he asks me to use my car to run errands. He said it wont be a habit but I’m not too sure. I guess I’m asking when do i lay the law about him paying half of everything if he is going to be using it. And he kind of mention that if it came down to it he can help pay for my car payment. I guess i don’t believe this lol, and i dont want to grow resentful of him using my car because he wanted to make his life easier and spend the money elsewhere instead of actually being helpful. He makes more money than me, i work so much to keep up because at this point i realize im living too high. And my husband sleeps at night and enjoy his retire days.

My husband believes in 50/50 doesn’t matter if you are pregnant, just gave birth etc, struggling or not, even if he has more he simple doesn’t help financially, thats why i feel this way and all this help me talk doesn’t sound real:(