I’m so sick of him 🙄

Me and my boyfriend have been together nearly 4 years now and I’m literally sick of him, I’m not enjoying sex, I don’t enjoy spending time with him no more, I’m bored and tired of this!!!!! he’s rude to all my family and will argue with my mum and me nasty to her, he gets angry about anything and everything, we have a little boy who’s 10 months old and I’m 10 weeks pregnant but I really can’t do this, if I tell him to go and tell him I don’t want to me with him he just don’t leave and tried being nice to me? He’s constantly looking at girls in public, he shows me no affection at all and does not care less about me only cares about him and his family ( who are a**holes) he also threatens to take our son if he has to go.... what the hell am I meant to do