Here is a sample template you can use to write a letter apologizing for flirting.
My thoughtless words and behavior have been weighing heavy in my mind since our last encounter on [Date] at [Location].
I understand that my actions on that night made you uncomfortable, and I take full responsibility of that. I treasure our existing relationship and it was not my ulterior intention to start something of romantic nature by flirting with you.
It was a lapse of judgment on my part.
I assure you that the flirting was innocent in nature. I hope we can put this incident in the past and continue our usual relationship going forward.
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