Why do alot of girls like songs that are about cheating?

ive noticed that when im drivin with my gurl and a song like "let it go" by keyshia cole or "irreplaceable" by beyonce comes on she has to sing them and you can tell she is really into the song. but when a song comes on that talks about how special the gurls man is too them she really doesnt really feel them. also why does it seem that alot of female artist singles are about how thierman is no good. I a treat my girlfriend right so why does she do this?