Ahhh why!!!!!

Why is it so hard for me to leave this p.o.s bf of mine the only thing good is the sex he doesn't do shit for me . cheats on me calls me names .I'm 24 weeks preagant I have another kid with him I would back my back for this guy. But I want to leave him and move on I would be so much happier but when I think about leaving him I cry I love him how did you guys pick up and leave someone u love I need help my heart is breaking