I'm saying this more because before he couldn't defend himself, and now he can: If the MC still couldn't defend himself, she would continue bullying him. And she wouldn't have done anything to stop her boyfriend (who seems to be the ringleader) from continuing to do it too. No matter how hard you try, I don't think I'm going to like her.
I'm not going to play Cosy Cafe because I started it and didn't like it, so I don't know who Catherine is.