How to take revenge on a player ?

Ok… so this guy has broken maybe 08 – 12 hearts in the past month….. including mine and one of my close friends….. He dates a girl for maybe a few weeks or even days, acts like he cares so much, then dumps them and then catches another girl… and this process repeats over and over…. he's so thick skinned, he never even feels sorry and goes on playing with emotions and breaking hearts…. So my friend and i decided that he needs to be taught a lesson.
Any ideas how we can take revenge ?? He made both of us cry and now it's his turn to taste some of the pain……