Apology Letter For Affair

Dear {Recipient},

I can't count the number of times I started this letter, only to delete everything I've written. Sometimes, there are no words to adequately express the guilt and regret one feels about something they did, especially when they've hurt someone who loved and trusted them so deeply.
I know “sorry” is not enough for what I did, but I'm really sorry for all the pain I put you through. I was extremely selfish and risked everyone's happiness. Being unfaithful is unforgivable, and I deserve all the anger that you feel towards me.

It pains me to see you hurting and I want nothing more than to regain your trust and rebuild our {relationship/marriage}. You probably want some time alone though, so I will give you the space you need to heal. Where we go from here is up to you. I will accept whatever decision you make, but I'm still hopeful that you'll allow me to repair the damage I've done.

Again, I'm deeply sorry for the hurt I've caused. Please take good care of yourself.

Thinking of you,

{Your Name}