Lonely....

Not sure if anyone else is in the same situation as me but I could use some words of encouragement and some loving advice. I don’t need to be told how dumb I am for staying,I already know that trust me. So my bf and I have been together for 5 years. We got pregnant with our first son after only being together 4 months. In the beginning everything was great (honeymoon stage) and then that’s when I started seeing red flags. Long story short he has cheated on me multiple times and he has disrespected me countless times. We’ve broken up a few times and worked it out. My reasoning for wanting to work it out was obviously to be a family and because I want the best for my kids. Now like I said we have broken up before and it was a full on war for custody for my son. I in no way want to take him away from his kids but I know 1000000% my kids are better off with me for so many reasons I don’t even have enough space to type. So that’s another reason to stay is because I don’t want my kids to be fought over like objects. And I know he will stop at no cost. I do love him but I am so unhappy. I just feel stuck. We moved to Florida and my family is back home besides my mom and brother. My mom isn’t the most stable person and I don’t want to burden my brother with my issues. We have 2 sons and a baby on the way. It’s kind of when we’re good we’re good but when we’re bad we’re horrible. I’m just so nervous to actually leave. Plus I don’t even have anywhere to go. He’s so mean to me and doesn’t even care he hurts my feelings. I’m just so lost and lonely. I just want to be happy and give my kids the best life.