Lost in my relationship

My spouse and I have been together for a little over 2 years. We are supposed to get married this November and I’m currently pregnant, due in February. My SO lost his job and started working somewhere else, but hates it. He hates every job he has. Constantly complains about them and the customers he encounters, which is fine I understand not liking to work. But he refuses to do any job that involves manual labor, he does have a metal rod in his femur from an accident last year. I’m disabled and still working, but with being pregnant I’ve had to go down to part time. I’m covering rent this month on my credit card and he says he’ll help me pay it back. It’s been a rough summer for us. His car is also breaking down, it needs the front wheel bearing fixed (again) and an alignment. He popped his tire the other day and his parents helped buy a used set of front tires. The thing is, he threw a fit about his car yesterday all day long and was extremely ungrateful and honestly incredibly rude to me. I found out from his parents that his grandparents are co-signers on his car, which is fine he just never mentioned it to me. But they also pay his car note, which he also didn’t mention to me (this is the big deal). He wanted to sell his car earlier this year (before it had started breaking down) and I had told him to wait because my car had been shitting out and we needed one reliable car. My car finally gave out and I traded it in and got the least expensive, but still new 2021 car I could find. I have really low payments and can afford them on my own. I also pay my health insurance, car insurance, half rent, our groceries and toiletries and vet bills/prescriptions/grooming for our dog. His bills (or so I though) included phone bill, car note, half rent, electric (if it’s not too expensive otherwise we’ll split it) and WiFi. But now I find out his $350 car payment isn’t being paid by him so where’s the money going? When I confronted him he got very angry and started yelling at me. I called my mom and went to stay at their vacation house near us with my dog. I love my SO, but he does get angry often and will yell at me over simple things. I’ve tried many times to talk about finances with him, but it’s like he never gives direct answers and somehow never has money. I’m very conflicted because I’m supposed to be marrying him in 3 months and having our child in 6 months. I don’t want to coparent with him because I know he’ll be spiteful and vindictive the whole time. And while part of me wants to leave him, the other part just loves him so much. I almost feel like I shouldn’t have decided to have a child with him, but at the same time I didn’t know he was lying about this stuff… how was I supposed to know…