To Forgive and To Forget, Really... how do you do it? Options

Have you had someone really important and beloved to you do something really bad/dissapointing/whatever to you which you simply cannot forgive, not to mention to forget? When in the end you ended up filled with so much hate, mixed with love and resentment no matter what you've tried to really forget and forgive? And the feeling still there like for 2 years as it kept popping into your head even when you were not intentionally want to think and when you least expected it? Well, maybe I'm in a bad mood today, but really... I want to hear your thoughts and experience on dealing with this.

I for one am not a forgive and forget kind of person. How do you get past a deep betrayl even years later? I (as most people) have been severely betrayed once (at least that really mattered) and I just held on to it for years and years...it has not been until recently that I have been able to completely let go. I was able to do this through ritualistic purging of myself (thoughts, feelings, emotions, expectations disappointments, etc) I just let it all out and it actually no longer bothers me at all. I think about what happened at times, but look at it as an experience in learning (a costly one) and growing, but ti has no ill effect on me any longer.