"Every day, think as you wake up, today I am fortunate to be alive. I have a precious human life. I am not going to waste it. I am going to use all my energies to develop myself, to expand my heart out to others, to achieve enlightenment for the benefit of all beings. I am going to have kind thoughts towards others. I am not going to get angry or think badly about others. I am going to benefit others as much as I can." - His Holiness, The Dalai Lama
If you are still holding onto something because you want to be right, let it go. Let go of the anger, the hurt and hostility. I mean, if God would allow His Son to die on a cross for my sins, who am I to hold you to a higher standard of accountability than He did (does) me?
Anger will never disappear so long as the thoughts of resentment are cherished in the mind.