Dear {Recipient},

I would like to offer you my sincerest apologies for {the thing done}. I threw you under the bus when we
should've been a team. I'm really sorry.

You've been an integral part of the company since day one and I've always admired your {characteristics}. Maybe it was jealousy that caused me to behave the way I did, but there is no excuse for what I did and I'll make sure it doesn't happen again.

I hope you can forgive me. I'd love to buy you a coffee to make it up to you. Please let me know your availability this week.

Sincerely,

{Your Name}

Dear [Name],

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.

Sincerely,

[Your Name]

Stealing Girlfriend

Hey {Recipient},

I don't know why you keep saying I stole {girlfriend's name} from you when I clearly didn't. You know very well that the two of you had already gone your separate ways before I even came into the picture. You can check the timestamps on your {text/private} messages in case you forgot.

Look, I'm sorry things didn't work out between you and {girlfriend's name}. But blaming me for something I didn't do is insane. You need to move on, {man/girl}.

{Your Name}

Dear [Name],

I am writing to you to express my sincere apology for my unfaithfulness. I know that I have hurt you deeply and that you are probably feeling a lot of pain and anger right now. I am so sorry for what I have done and for the pain that I have caused you.

I know that no amount of words can make up for what I have done, but I hope that you can find it in your heart to forgive me. I realize that I have made a mistake and I am willing to do whatever it takes to make it right.

I understand that trust is an important part of any relationship. I have broken that trust and I know that it will take time to rebuild it. I am willing to put in the effort to do whatever it takes to regain your trust. I want to prove to you that I am committed to this relationship and that I am willing to do whatever it takes to make it work.

I know that I have hurt you deeply and that it will take time for you to heal. I want you to know that I am here for you and that I am willing to do whatever it takes to make things right. I am willing to talk through our issues and to find a way to move forward.

I am so sorry for what I have done and I hope that you can find it in your heart to forgive me. I know that I have made a mistake and I am willing to do whatever it takes to make it right.

Sincerely,

[Your Name]

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}

Dear {Recipient},

Where do I begin? I messed up real bad—{number of} years with the most amazing {man/woman} I've met, and I threw it away like it was nothing. How stupid can I be?

You've been nothing but kind, caring, generous, supportive—everything that I could ask for in a partner and more. You didn't deserve any of this. What I did was wrong and unacceptable, which is why I've already ended things with the other person. Whether you take me back or not, it really is over between {him/her} and II'm very sorry for putting you through all this.

You might not believe me, but I still love you and I hope that you'll give me another chance. What's done cannot be undone, but I promise to make it up to you and I'll prove that I'm worth staying with. I'm really, really sorry.

With love and regret,

{Your Name}

Dear [Friend],

I am writing this letter to apologize for the unjustified betrayal I have caused you. I know that my actions have caused you pain and I am truly sorry.

I realize that I have been selfish and inconsiderate in my actions and I take full responsibility for them. I should have thought about the consequences of my actions and how they would affect you. I should have been more mindful of our friendship and the trust that you had in me.

I understand that my betrayal has caused you to doubt me and our friendship. I want you to know that I am deeply sorry and I regret my actions. I want to make it up to you and prove that I am a trustworthy friend.

I am willing to do whatever it takes to make it up to you. I am willing to talk openly and honestly about the situation, and I am willing to take any steps necessary to rebuild our friendship.

I understand that it will take time for you to forgive me, and I am willing to wait. I hope that you can find it in your heart to forgive me for my betrayal. I promise that I will never do anything like this again.

Once again, I am deeply sorry for my actions and I hope that you can forgive me.

Sincerely,

[Your Name]

Dear [Name],

I am writing to apologize for deceiving you in a way that was unwarranted and wrong. I understand that my actions have caused you pain and distress, and I am deeply sorry for that.

I know that what I did was wrong, and I should have been honest with you from the start. My deception was wrong and I regret it deeply. I can only hope that you will be able to forgive me for my mistake.

I understand that my actions have caused you to question my trustworthiness and integrity. I want to assure you that this was an isolated incident, and I will never again engage in such behavior. I have learned my lesson and I will strive to be more honest and open with you in the future.

I am sorry for the pain and distress I have caused you. I hope that you can find it in your heart to forgive me, and that you can believe me when I say that I will never again deceive you in this way.

Sincerely,

[Your Name]