😪 please help me

Literally only with my boyfriend because we have a kid on the way. He's changed so much. He's a horrible boyfriend. He's always disrespectful and rude. He has damaged my property. He bipolar and doesn't take meds for it. He's done absolutely nothing for his son unless I've made him. He wants to do literally nothing yet things he has a say in what to get and anything to do with the baby shower. I've done it all myself why should he get to do the lazy easy things. He literally begs me for sex no matter how much I say no. The only times we have sex is because he wants to. I miss the man he used to be. I feel so stuck. I've tried to leave him but he refuses to let me brake up with him. What do I do?