(Ive had a few so ill do .. 2 of them i think - they’ll be short)
Dear ex girlfriend,
Im sorry we fell apart. Im sorry we just stopped talking. You were honestly great and i wish we hadnt ended that way. Its been years and im still annoyed at how i ended it. I hope you’re happy now..

Dear ex datemate,
Im sorry i hurt you so much. I disagree with you entirely on why we fell out + im still salty over that, but im still sorry i hurt you. I really did care about you + i never meant for this to happen. I hope you find someone who’ll love you forever, you deserve it.