Write a letter to the person that you hate the most/ caused you a lot of pain

Dear "You know who you are",

Too long, I waited on you.  Im much happier without you.  Hope you realize one day what you missed out on.  You will never find anyone better than me.  Maybe one day you wont be such a prick.  Don't forget the 10 times rule.  All that you put me through is going to come back on you tenfold.

Glad you are out of my life.