Staying together & living apart

My boyfriend and I have a 1 year old and he has a 5 year old from a previous relationship. Our cars are falling apart and in my opinion aren’t safe to have the kids in. So we need new cars, plus we have credit card debt and an extremely high electric bill. I think the best thing is to live apart and move back in with our parents so we can save up money and get the necessary things we desperately need. I mentioned the idea to him and he says no and that if I move out he’s taking it we we’re breaking up. I’m not the happiest with him, we have a lot of issues and I don’t necessarily agree with the type of person he is. And on top of all of this, I just found out I’m pregnant again and have no idea what to do.