You know the old adage "there is power in numbers?" Well, couple that with girl power and you'll be rendered pretty weak; she'll be a force to be reckoned with. Break her heart in front of her friends and be prepared to fight a battle you will never win. Your girl might be in a corner pouting and shocked to find herself single again, but her ride or die girlfriends know the proper routine and procedure for handling dudes who toy with their BFF's emotions. Don't risk it.