abusive ex and moving on..💔

my ex used to come home drunk and high every night, when he seen that i was asleep and not waiting for him to be back he would be abusive.. ive had to be rushed to hospital twice. he's cheated on me four times but every time id try to run away or break up with him he'd threaten someone i cared about or hit me and make me stay. its been two years since i managed to get away from him and everyone is telling me hes changed a lot since he spent 11 months in prison because i called the police on him. he's been sending me letters from prison telling me how sorry he is and how he wants to prove to me that hes changed. i want to move on from him but im scared that every guy is going to be the same. how can i make it easier for myself to move on?