Most Helpful Guy
If your standards for your own conduct depend on how others treat you, then you have no standards. If you do that to him, aren't you acting just as poorly as he has acted?
Most Helpful Girl
You have the option right now to not let the actions of someone else turn you into the very thing you dislike. Karma is an absolute bitch, and what goes around, comes around. Clearly you have at least some small voice in your head telling you this is wrong--stop, and listen to it, before you end up doing something you'd never want done to you. Besides, revenge is not going to make the situation better, it's not going to make this guy a better person, he's not all of a sudden going to be so sorry for what he did to you. He will just change his number and move on in a second.