Can't stand my faincé / father of my kids.

Y'all I've been with my kids father for 6 years as a stay at home parent since I got pregnant with my now 5 yr old daughter and we have a 2 yr old daughter and a 9 month old baby boy! And I'm so done with this relationship. I left back in October for 3 days and I came back bc I couldn't look at the kids without crying bc they all 3 look just like him so I came back 🙄 and it's not gotten any better what so ever. He thinks he can leave and stay gone for hours bc he's mad at me and he thinks he doesn't have to be a father and I'm done with his shit and he just got a sports car that is only a 2 door and won't fit 3 kids, we do have other family cars but my issue is how he spent all of our income tax money on a car that was 5K and then he ended up buying All new parts and didn't give me a dime. He literally gave me $6 dollars and I ordered our 5 yr old a Elsa water bottle for school this August plus she's been asking for one and we was supposed to be renting out a cabin and going on a romantic trip and get me and him and all 3 kids new clothes bc there clothes barely fit and are getting tight NUN OF THAT HAPPENED EXPECT FOR HIM GETTING HIS LITTLE SPORTS CAR & ILL POST PICTURES OF THE CAR SO YALL CAN SEE 🥴🙄and so today I asked him if he could give me my part of the money with his work checks and he literally said he will whenever I put more into him like sex and what not, like wtffff and he got in his new little car and left and haven't messaged or talked to him since and before he left he said he tried to keep this family together BS & HE ALSO LIKES US FIGHTING ON. U BPD EPISODES. I HATE HIM AND CAN'T STAND HIM, I DO LOVE HIM BUT DON'T WANT TO BE WITH HIM ANYMORE. And our 3 children only know us and his mother and my dad. We live with his mother and my dad lives 2-3 hours away.