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've never been able to hold a grudge.
But then i don't really expect other people to be trusted either...

I think the hurt is really an ego problem.
You lose face, the ego is hurt, and then you have to build up your ego again, mostly by reasoning that the other person is at fault and that ones self is not to blame, and such...

I don't know, i cannot explain it, but its not a problem i have.

I don't even hold grudges against the worst people. And i have been betrayed more than most of the people here. If you want to know my story, then i will tell, but i don't think it is necessary.