Why does this shit bother us even if we wouldn't take the girl back for all the money in the world? every time I think of her with some other dude I get a sharp knife pain to my stomach.
. But I don't want her 
FFS i thought you were supposed to be a top pimp, who was so good at dealing with women you was hiring out your expertise in getting women for others...and now you are here crying over your ex!
man the fuck up ! why are you thinking about her?, cut all contact, delete her from phone/social media etc, pretend she's dead.
problem solved, it's just a matter of metal strength (or weakness)