The story is kind of weird.
The girl doing the groping was walking around groping different girls (it was an after school drama club) many of whom were getting pissed, she came over to my gf and my gf warned her that if she did it she would get punched, she did it anyway and my gf uppercut her, I stepped between the to try to break it up and began arguing with the groper telling her to just knock it off and deescalate shit.
Then she groped me by shoving her hand down my pants and squeezing my balls so hard I thought I was going to puke, so I smacked her knocking her to the ground.
Right around that time literally everyone in the room started making their way towards me.
I pointed out what she just did and started saying how if anyone else tried to make the situation worse I was going to the police, this was enough to stop me from getting my ass kicked but me and my gf both left anyway.
Turns out the groper girl was some bipolar closeted lesbian and she actually apologized about a week later and said the situation was a result of her antidepressant prescription having recently been switched around.