Abused and Confused

My now recent ex is in jail for domestic violence, things have been going semi well for me since he's been in jail.  I have been experiencing some PTSD symptoms, but they slowly started to go away. Now his aunt and his mom have been messaging me trying to convince me not to go to jail. He's supposedly sorry for threatening tokill  me while holding a knife to my throat and doesn't want it to end like this. Well last night my nightmares returned. As far as I'm concerned he can stay in jail, whether he says he loves me or not. Yet there is still part of me that wants to believe he is better. I know for a fact that is not the case though, I miss him yet I'm so terrified of him.