How can I get over being hurt and abused in the past ?

I keep going to the past. It makes me feel guilty even more that I should let him go, but I don’t know how. Every day I keep thinking about different events that had let up to know. More so I also think about the girl he cheated on me with. I go back to her picture, his picture, and I keep replaying things in my head. I want to let my past relationship go, and also the abuse I suffered from him. I’ve tried to go to the movies, sit alone, walk outside, start school, but I still keep thinking about him. Even though he’s done immense amount of trauma to me, I still can’t let him go.

I want to find it in my heart and soul to forgive and let go. I don’t even want to remember, or remember her either, and I’m afraid I might bump into them one of these days.

How do you get over an ex, and more so how do you get over a relationship that was very violent and abusive ? I know he hurt me physically, mentally, emotionally – so it should be easier to let him go because I KNOW he is bad, but I don’t know why It’s so difficult.

I don’t want to remember him or the past I had with him, I just want to let him completely go, because I feel like he is drowning my soul.