I'm stuck in hell

Ok so me an my bf have been together for 1 year and 8 months and it's been nothing but fighting an arguments , an when I say fighting I mean physical 💔😩 , I have 3 kids who are not his an I'm currently pregnant with his baby , I feel as if he wants my kids to be away all the time because he try's to send them with their dads or my family but I always tell him no I will never send my kids away because of him , an like he's jealous of my baby boy because I show my son more love then him , I tell him he's my son of course Ima show him more love , I mean of course i show my bf love but not like how I am with my kids . Today we got in another argument an because I caught him either cheating or about to cheat an I found out he started choking me while my son was there , mind you I'm 19 weeks pregnant carrying his babygirl. I wanna get out of this but I have no help an I literally lost everything because of him so I don't have a car anymore !!!! I'm just so fed up with everything, on top of it we're homeless an staying at my bf mothers house because we have no where else to go and I'm having babydaddy drama from my daughters dad and to top it all off I suffer from major depression and anxiety, I feel stuck and hopeless for my kids 💔💔💔💔 My biggest fear is losing my kids !!!