I really need help/advice

I’ve been with my boyfriend for 5 years we have a 1 year old and another one on the way. Idk what to do because I feel like I don’t love him like I did, I’m not happy. We have both said hurtful things to eachother but he just hates everything I do, I feel like he hates me breathing most of the time. He tells me I cry to much and how I’m crazy. his best friend that he’s been with since kindergarten comes down from the mountains and he has a sister that is a year or 2 older than us and she is always all over my boyfriend and has blowed up his phone at 2am and left messages talking about how much she loves him. I know that’s like his sister but it really didn’t sit right with me, I got mad that he was with her the other night, he was with his best friend too but I feel like it should be respected that I don’t want her around. Then he told me that they are more of a family then me and our kids will ever be, he was drinking so idk if he meant it or not but I can’t get that out of my head, it’s driving me crazy. I don’t know how to leave or if I even want to leave. I do love him but as the years go by I feel like a burden and that I’m just fading away to him.