I figure this is in the right forum.
Today I hurt a very good friend of mine very badly. I’m very sorry that I hurt her. I’m fairly sure she will read this. I’m very sorry I hurt you. You deserve better than this.
Public penance can be good for the soul, but the appropriate action to deal with personal injury is to apologize to the victim in a personal way. (In descending order of preference: face-to-face, written letter, e-mail.)
I did.
Then hopefully your friend will see your contrition and forgive you.