Am I doing the right thing?

Am I doing the right thing, I will try to make this as short as possible, I met my now ex and father to my son just over a year ago things happened very quick for us, when I first met him he told me that he every now and again smokes some weed, and I accepted that, as I never saw him do it, then fast forward a few months and I offered him to move on to my pose as he was receiving death threats from apparently some old friends, later on I found out it was drug dealers. Once he was moved in he did not work and became quiet verbally abusive, did not want me to see friends, family etc, then the cheating started and when confronted he locked himself in a room, then when I asked him why etc, he blew up, I tried to leave, in my car, he stood in front and wouldn't let me leave, eventually I got away and went to a friends house. After a lot of angry messages I got the apoplectic ones and fell for it, went back. Then maybe a week later found out I was pregnant, a lot changed, he became more distant and still found out about more cheating, fast forward a few months, he said he would try to change, in this time he also lost his license, and yes I had to drive him to go get his weed, as he would loose it if I didn't, so I foolishly thought I was doing the right thing to try and keep him calm, I remember clearly one night maybe about 5 months pregnant he could not find any and I was tired as anything it was probably 11pm and asked if we could please go home as I was sick of driving, he lost it, grabbed my steering wheel and swerved the car, then punched the dash. He also told me to have an abortion so many times and threatened my life and to cut my throat off, fast forward to now I have finally left and applied for a dvo, I guess I just want reasurance I'm doing the right thing for my baby, he just became worse and couldn't stand the constant threats against me and my baby, he also sees no problem with his weed use which he spent so much on a week and his personalities change so quickly, I could not even sit on the couch or look at him without being called a c***, would get angry when the baby cried to much, but now I've finally left I think he's shocked but he told me to leave and said he wants nothing to do with the baby and to change name etc and trying to blame me which he always had and said I'm the one who makes him the way he is, I think I'm just coming to terms with it all. And also said to me don't make me go to jail for you and that he knows where to buy a gun and could get someone to do his dirty work. Sorry for rambling my head is just scattered at the moment as I'm scared he'll say he's done none of this and be aloud to see bub, I do have video evidence and photos screenshots etc.