You have always been true and good to me, but I have neglected you. I fear that this letter will cause you more pain and heartbreak than you have already suffered, but I feel that you deserve to know this. The truth is, I have been seeing another. It was hard at first, I still loved you and it felt wrong. But he was so new and exciting. He got along with all my friends and showed me so many new things.
There are no excuses for the wrong that I have committed. I do not expect you to forgive my selfishness and unfaithfulness but if you can find it in your heart to look past this and give him a chance, I have faith that the three of us will get along splendidly.