{{HUGS}} I know what you're going through! My daughter's father was abusive physically, emotionally, and mentally towards me for 2 1/2 of the 3 years we were together. Ex-girlfriends had restraining orders against him so I should have taken the clue in the beginning but I didn't. I struggled for over 2 years trying to decide how to leave him and the next before I found out I was expecting I just upped and left. I don't know what made me do it that night but I did and I'm so thankful for that.
FOB sounds like a real idiot. You're an extremely strong woman for leaving and it's for the better. Both you and that handsome little guy of yours are far better without him. I know it's difficult at first but it does get easier. Pursue the restraining order, make sure it becomes permanent. File for sole custody of Isiah. If he's physically abusive towards you chances are he'll be the same towards him some day, not to mention that children learn by example especially during the first couple of years. Stay safe. Move in with family, change the locks, deadbolt doors. My ex used to sit in front of my house for hours on end after Madeline was born, made threatening calls towards me while I was pregnant and after. He soon found himself in jail for violating the restraining order and his parental rights are in the process of being terminated.
If you need to talk, feel free to shoot me an e-mail!