Dear Daniel Vieira:
I second Matic on examining the relationship you had for six years and why you stayed in it through the three years it was not good. What is experience for if you don’t learn from it? It might not be the time right now to do this examining as you are struggling with your mind trapping you as you wrote.

Your original question was: “Should I try to forget her by replaying all the moments she made feel bad and did not treat me as I treated her.2) Just forgive her and all the bad thing she did to me and let it all go.”

My feel for it is NOT to replay moments with her. When thoughs about her come to mind, don’t dwell on them, if you can. Allow them to enter your mind (you can’t control that) but don’t engage with them. I also think it is not time to fogive her. In other words, this is not the time to either blame her OR forgive her. It is time to relax as much as you can, create space around your emotions (I read this term on this website: make space around your emotions) so that LATER you can think better. It is not time to think much when your emotions are intense. I very much like Matic’s suggestions about how to do that.
anita