I’m sorry this challenge still bothers you like this. That you still feel a need to speak your piece to feel some kind of closure for yourself.

I have experienced this challenge myself being treated horribly when I did not deserve it. Especially when the individual invaded my boundaries and continued to do so. Even smearing me by lying. No letter can change a person like this either. All any letter can do is clarify and confirm to yourself that you are making the right choice by completely distancing from the person.