Dear {Name},
There's no other way to put it: I was downright mean to you. I am so terribly sorry. You did not deserve that kind of treatment, and I was completely in the wrong.
I never should have {said/done} the {mean thing}.
I'm ashamed that my personal issues led to me treating you so terribly. I'll understand if you're unable to forgive me, but please know that I have scheduled {therapy appointment/anger management coach/etc.} in the hopes that I can learn what triggered my mean and inexcusable behavior and keep it from happening in the future.
Sincerely,
{Name}
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