Dear [Name],
I am writing to apologize for my lack of diplomacy in our recent interaction. I understand that my words and actions were hurtful and I am deeply sorry for the pain and distress that I have caused.
I want to assure you that my behavior was not reflective of my true character. I understand that I should have taken a more diplomatic approach to the situation and I regret not doing so. I take full responsibility for my actions and I am deeply sorry for any pain or discomfort that I have caused.
I understand that my words and actions have had a lasting impact on our relationship, and I am committed to rebuilding the trust that has been broken. I am willing to take any steps necessary to make amends and to ensure that this type of situation does not arise again.
I understand that my apology may not be enough to repair the damage that has been done, but I hope that it is a start. I am committed to being a better leader and a better person, and I hope that you can find it in your heart to forgive me.
Once again, I apologize for my lack of diplomacy and I am truly sorry for any pain or discomfort that I have caused.
Sincerely,
[Name]