Dear {Name},
I'm so sorry for letting my anger get the better of me. The way that I behaved was unconscionable and I'm sorry that I took my temper out on you. I wasn't thinking clearly and I should never have {said/done} those things.
I hope that you can forgive me for my lack of composure. I promise to think things through and behave in a calmer manner the next time I get upset.
Sincerely,
{Sender}
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