In life only one thing is certain, apart from death and taxes. No matter how hard you try, no matter how good your intention you are going to make mistakes. You, are going to hurt people and you are going to get hurt.
And if you want to recover, there is really one thing you can say "I forgive you."
Its good advise but its not very practical.
When someone hurts us, we want to hurt them back. When someone wrongs us, we want it to be made right. Without forgiveness, old scores are never settled, old wounds never heal.

And the most we can hope for is, that one day we will be lucky enough to forget the hurt!