On {Date} at {time}, I was responsible for an unfair and violent assault upon you and {Name}. Just writing it makes me sick inside. I have never thought that I would be capable of such actions and I can't begin to express how sorry I am that I hurt you in any way.
There is no excuse or provocation for such behavior. I would like you to know that I am addressing this problem immediately. I have admitted myself to {therapy/anger management/etc.} in order to confront and deal with the anger and aggression that caused this regrettable incident.
I hope that you can find a way to forgive me. I'm very sorry for hurting you.
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