Dear {Name},
I am so sorry for my {behavior/comment}. It was hurtful, inappropriate, and completely out of line.
I don’t know if there’s any way to make it up you, but you have my sincere promise that I’ve learned from this and will do better in the future.
It’s not much, but here is a {plant/gift card/etc.} as a small token of my regret. I hope that you can forgive me.
Sincerely,
{Name}
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Index of letter of apology templates