D
You're allowing someone to live rent free in your head. They moved on with their life, probably don't even remember this, but you are hung up on this still. You yourself are putting yourself in a position of a loser. You said it yourself "it's just a couple of letters", so why does it matter so much? Why are you seeking validation from someone who you don't consider worth your time?


And a good person that fight back, is indeed not in the right, but they also not in the wrong.
(if it ever happens that she comes back and apologize, i would apologize too (though maybe she wont accept mine))