Dear [Friend's Name],
I hope this letter finds you well. I am writing to express my sincere apologies for my recent behavior, which I deeply regret and for which I take full responsibility. I am truly sorry for any hurt or inconvenience I may have caused you.
I realize that my actions were inappropriate and thoughtless, and I understand the impact they have had on our friendship. I want you to know that it was never my intention to upset you or cause any harm. Looking back, I can see that I acted impulsively and without considering the consequences of my actions.
Please believe me when I say that I value our friendship immensely. You have always been there for me, and I cherish the bond we share. I understand if you need some time and space to process what has happened, but I hope that we can eventually work through this together.
In the meantime, I am committed to making amends and doing whatever it takes to rebuild your trust in me. I am willing to listen to your perspective, apologize in person if you would like, and take concrete steps to ensure that this does not happen again in the future.
Once again, I am truly sorry for my behavior, and I hope that you can find it in your heart to forgive me. Our friendship means the world to me, and I am determined to do whatever it takes to make things right between us.
Thank you for taking the time to read this letter. I am here whenever you are ready to talk.
With deepest regrets,
[Your Name]