AITA??

A few months ago my bf and I got into a very heated argument for something I feel was very unnecessary. I have a car that is mine, it is paid in full, I purchased it back in high school, I’d still be driving it as my everyday car if it wasn’t having mechanical problems. (it’s nothing major but the breaks aren’t working properly) We’re gonna call this Car #1. I also have another car that is not paid off. That is my everyday car. we’re gonna call this Car #2. Because we were behind on bills a few months ago, he felt like I should sell car #1. Why would I sell my car that I paid for especially in this economy?? Cars are extremely expensive right now, why would I give it away for little to nothing just to pay half the bills for one month? Makes no sense. I’d rather get my car fixed an have something I can always rely on if something happens. We ended up actually separating for a few weeks because of this problem. I feel like he’s being extremely possessive over something that does not have anything to do with him. Fast forward, earlier today we were talking about getting a family car for more space. We have a toddler and i’m due with our second child next month. He also has 1 child from a previous situation and he also watches another child. In order for him to have everyone in the car at once, HE NEEDS a bigger car. My 2 children and myself fit in my car perfectly fine🤷🏽‍♀️He has a truck that he drives and clearly said he’s not getting rid of his truck but says I need to get rid of my car so we can get a family SUV… if anything, he can get rid of his car is the way I see things. I just don’t understand his logic or why he feels so entitled to my things. Granted, if we’re in a relationship what’s mine is his and all that good stuff but at the end of the day, I’d never tell him to get rid of things especially for no good reason. His truck is $800 a month and he ended up needing a new engine which was $3000. he ended up getting behind on bills, registration, etc and that’s why we we’re struggling from the beginning. So what sense does it make to add another car payment that we already cannot afford?? Then he’s really pissed because I said no, like to get an suv in this economy, with a minimum of 5k down, payments would be at least $900. We rarely go anywhere all together anyways so I’m confused as to why he’s making such a big deal out of it. If I’m tripping PLEASE help me understand how, because it’s driving me insane! He’s making it like i’m the dumbest person ever because I don’t want to get rid of MY car.