Whats the chance he will hit me again?

hes put his hands on me and thrown things at me atleast 10 seperate times in the last year. Only when he was drunk then the last time he did it he was sober and threw me ont he ground twice knowing that i was 5 weeks prengant with his child.He also threatened my life that night. this was only 2 weeks ago and i didnt lose the baby. He said it will never happen again and hes sorry. Of course hes said that every other time so i find it hard to beleive. He said he would go to therapy but really does thereapy help? I haevnt seen him make an effort to go to therapy though he has been nicer then hes ever been for the last 2 weeks but then again i have barely seen him. hes always gone plowing suppoively(i think he cheating) I pretty much jsut want to know if theres a high chance that he will put his hands on me again or if theres a good chance he will never do it again. I haeva 3 year old from a previous relationship that hears him call me anmes all the time he smokes in the house even when i ask him not to but then when his kid comes into the world he said there will be absoluetly no smoking in the home. are you kidding me? my kid means that much less then yours? should i get out or stay? dont post if you haev never witnessed or been in this kind of relationship before