Someone please give me a little advice on what I should do about him?

So I have been dating this guy for a few months and we have both fell hard at least I thought the only problem is he cheated once and he felt really bad about it so I thought we are both from different back grounds I am a good girl and he is a bad boy. Anyways I ended prego with his baby and he is deployed before he left we were still together and working it out you know for eachother. He left his car and all his stuff with me for 7 months. Long Story short he cheated on me again with a girl who is a crazy liar and has threatened my life and my baby's (dont worry I went to the cops) but now I am so stuck he wants to work it out with us and wants me to stay. I have left him and I even told him to not bug me about it. Here is the thing is there such a thing as men cheating times and stopping? He says he is done and he wants to change for me and him he likes to say we need to just work on us which in away is true because I dont trust him and I wen thru his things this is how he got caught... I just dont know he doesnt love me because he cheats but he does part of me thinks have issues with just being in love I know he has been hurt alo in the past but I just need advice Im also worried about having this kid i mean i think it will be hard for me and my baby to deal with being without him?? I dont know