Idek , feel like I'm drowning

Long story short and can give more context if needed . Been together almost 7 years. Had ups and downs. Recently me and my son moved back with my parents for a bit due to some circumstances (he caused at last place) haven't seen him in two weeks. He came to see me yesterday during work took me to lunch ( only had an hour) he came late so I had to push lunch big. Mind you. I have a son I'll need to get from the bus. He gets so mad that i didn't sit on in mid day in a car idk where dmn sure not at my parents house. Another thing I'm saving for a car he knows I need (he doesn't like (how it seems to me) me using his car ) and as an adult with a child I need one. He could stay with his sister doesn't want to, so spend money on places to stay for days-weeks at a time. And now he is trying to make it out like I don't care about him bc I won't use my car money to get us a place mind you I put up most of the money for the last place we had minus his 200 he got from family). I need that money for a car last time I spent all my money on bills and couldn't get a car last year and he says he isn't helping me get one (put money down) since we not married. I told him as soon as I find car we can find a place and I have a few tbh (he says he wouldn't wanna stay there thou) I just need to be able to be mobile to get be able to make more. Just feel like I've been isolated...