A wise man once sat in the audience & cracked a joke.

All laughed like crazy. After a moment he cracked the same joke again and a little less people laughed this time. 

He cracked the same joke again & again.
When there was no laughter in the crowd, he smiled and said
"When u can't laugh on the same joke again & again, then why do u keep crying over the same thing over and over again"


Forgiving yourself or others who may have hurt you is key here.You must forgive first in order to forget!People are not perfect and everybody makes mistakes.