Dear {Name},
I never should have said what I did. I was totally out of line and I hope you can forgive me.
I'm not sure what made me think it was OK to say that. It wasn't. I understand if you're not able to get past this, but please know that I never meant to {hurt you/be a jerk/reveal your secret}.
I really value our {friendship/family relationship/business connection}.
Sincerely,
{Name}
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Index of letter of apology templates