Dear {Name},
I know it was wrong of me to {action} and I feel awful that the only thing I can say is "I'm sorry." But I am, so I'll say it as many times as I need to in order to convince you of how terrible I feel about this.
I'm really sorry that I {effect of behavior}. I swear that I will never do it again. I've learned to think long and hard about how my actions affect others and I believe that will help me to make better judgments before I {speak/act} next time.
I know it's selfish of me to ask your forgiveness, but I hope you believe in my sincerity and accept my apology.
Sincerely,
{Your Name}
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Index of letter of apology templates
