Could you point out what I did wrong?

A mistake does not last for a long time but a friendship lasts forever. Anybody does not remember mistakes. If someone remembers mistake, he or she has a closed mind. I want to say that mistakes will be forgotten quickly. For example, my friend Lee made a mistake that he broke my precious gift. However, I forgot about it just after two days, and I felt at peace with him. Some people might say I am silly, but I think mistake is more forgettable than friendship.