Love is patient. Love is kind. Taken from the Book of Corinthians in the Bible.
On my own experience, when you love a person, no matter what he/she did to you or anything that cause you sadness, being mad or even angry. I believe this will all fade away with just one sorry of that person. It seems so easy to forgive when your love is genuine.
I hope and pray that everyone must deeply understand what love really is. It is not just uttering i love you to a person. It is with action.