I am writing this letter to express my sincerest apologies for my infidelity. I know that I have hurt you deeply and that no words can fully express the sorrow I feel for my actions.
I realize now that I was wrong to betray your trust and that my actions were inexcusable. I know that I have broken our relationship and that I have caused you deep pain and suffering.
I am deeply ashamed of my behavior and I regret it deeply. I know that no amount of words can make up for what I have done, but I want you to know that I am truly sorry.
I understand that I have hurt you and that it will take time for you to forgive me. I want you to know that I am committed to rebuilding our relationship and that I am willing to do whatever it takes to make things right.
I am committed to being honest and open with you in the future and I will do my best to rebuild your trust. I understand that it will take time, but I am willing to do whatever it takes to make things right.
I am truly sorry for my actions and I hope that one day you can forgive me. I know that I have hurt you deeply, but I hope that you can find it in your heart to forgive me.