I've found some interesting personalities through clicking my "Random LJ" bookmark a couple of dozen times, but just now I encountered a girl who admits to paying attention to the mean guys and playing hell with the nice guys, and hates herself for it.
Her reasoning is that she is scared of the very idea of love. She wants a nice guy and a real relationship, but when she falls for a nice guy she closes up and ends up scaring him off. Then, she starts paying attention to the guys who treat her like crap and don't give her the time of day. She feels like damaged goods.
Her entry certainly answers a lot of questions I had about certain girls formerly in my life. She, meanwhile, shall remain nameless.