Got to say there is nothing that makes you look more of a tit than beating up the ex's new guy!

Unless he was dipping before you split, then he aint done sod all to you, why should he get out of the car and have a toe to toe with someone who is sore about loosing their bird and run the risk of either a kicking or if he hands your arse to you on a plate, runs the risk of getting knicked?