Forgiveness is difficult. When challenged with it, I like to read Luke 6: 27-49. Basically, Jesus speaks of forgiveness - says that even a sinner can love someone who loves them - but as Christians we are called to do better, and to love even those who hurt us.
Love is an act, a decision -- I think people forget that and think of love only as a feeling. Jesus doesn't expect us to have warm fuzzy "feelings" for the people who hurt us, but to act as kindly toward them as we can - to be merficul towards them as God is towards us.
I've been lurking on these boards for awhile, trying to get the energy to post my story - I'm afraid the post will be too long!