How can I forget about them?

I dumbed my “friends” over a year ago. They were complete asses, and they made my entire high school experience suck. They are the worst people ever and I hate them so much. Yet, I am constantly reminded of them every single day. I mean, every single thing relates to them, and the ways that they tortured me. I really want to forget all of this, but I can’t. There is absolutely no way that I will forgive them. What can I do to solve this problem?