There is a girl who I used to be with, who did me real bad. I don't always realise this, but deep down, I really hate her now. But I can't seem to get myself to show that in any way. I'm being nice and helpful, but deep down I don't wanna be. I want revenge for what she did to me. I want to make her feel that she is of no value to me. I want to be repulsed by her. Not obviously. But she has to feel it.

What are your suggestions?

FYI we're both in a friend group so we meet each other often.