Should I go back?

I am 19 years old pregnant with a 4mo babygirl, their father left me a few days before valentine's day telling me to take our daughter and just go....I cried so much I'm not sure if it was because I felt free finally besides the heartbreak...and I say that because he would hit me, throw me around while pregnant as well, he cheated on me when i was 8 months pregnant, etc...but I never did anything I gave up my all down to my family, my career, etc. I love him so much honestly and I feel as if he could change however I got my kids to watch out for, i just got a job and the news of another baby on the way....i don't want to give it all up again...