Toast, I'm going to assume that you are speaking of teenage girls that have not yet learned that the douche bag guys out there are not the ones for them. It happens all the time. After they get dumped or leave the guy because of his apparent rudeness or lack of compassion toward others, girls will go for the guys that really do care about them and will want to make them happy.
Girls just indulge in the simple, yet wonderous parts of life. While we boys concentrate on the over-all picture and base our thoughts and feelings on what is most rational during the current situation.
Here's an analogical example:
Boys focuss on the donut
While.
Girls fucuss on the donut hole.
Sooner or later, the girls will forget about the donut hole and will eat the donut.