An Anonymous Letter, Part I

Dear X,

I write to you today in order to update you on an event from my past.

Although I was honest and completely loyal to you throughout the core of our partnership, it is with deep regret that I admit to my brief, one-time affair that I engaged in immediately prior to 'us.' This did not mean anything to me at the time, outside of a chance to have some exploratory fun.

Thank you for your time.