Thanks for being open to this. As mentioned in my earlier message to you, the purpose of this letter is to apologise. It is really hard to put together an exhaustive list of situations that may have caused you harm, So I won’t.
That being said I want to admit to and apologise for my attitude and actions. In our relationship and interaction I have been self-centred, inconsiderate, fearful, resentful, dishonest and self-righteous. On many occasions it was all about what is convenient for me, what was right for me and what was fun for me. To a large extent your feelings, circumstances, efforts and all else was secondary, and I am truly sorry for that.
You are under no obligation to respond to this. Though if you do, I will listen with a humble attitude and do my best to make things right.
I would also ask that you keep this confidential.