Hello, /adv/, I'd like some advice on how to deal with this guy at my course.

Dude's a 9/10 gymfag that pretty much monopolizes all the girls in our group.

He poses as a shy, sensitive and loving guy to get in their panties but behind their back he is a total dick, talking about the ones he's fucked and the ones he plans to fuck.

Thing is... only us dudes know who he really is, the girls have no clue and they're all head over heels for him. I just want to find a way to expose him for what he really is.