have worked on various 'drafts' of the message I plan to send to my ex...in my case, she still hits me up and wants to make small talk as 'friends' so part of my reason of writing her is to let her know why I am no longer interested in being friends.

I've read somewhere that the best tactic is to write whatever you need to get it off your chest and then destroy the letter without sending it...writing the letter is more for the benefit of the letter-writer than it is for the recipient.....so writing the letter helps to analyze and process our own feelings...and destroying the letter helps to signify moving on.