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 know someone who thinks that to. But in fact its because he is full of himself that people don't like him.

The person in question thinks he is better than everyone else, that he is Superior. And he does a poor job hiding his self proclaimed superiority. While he truly is smart and above ordinary, he certainly is not the only one, and there are many better than him.
His personality turns really ugly if he meets someone better than him, he is unable to cope with it.
He just has a detestable personality to be around.

I'm not saying that's the case with you, but it never hurts to make sure.
Just a friendly insight i give here.
It probably does not apply to you, since people working with magick tend to be more spiritually developed than that.