This is an old question, but.....
Remember when Kelly went out with Bert, right? Who dumped who and why? Seriously.
"Potter, let Malfoy kick it ol' skool or its detention!"
Well Bert dumped Kelly on Valentines Day in one of the episodes. Kelly was upset and the family was pee'd off. Somewhere i read that he dumped Kelly jsut because he didn't want to be associated with her in the press and all, cause hes in a band of his own. He was thinking about his image, and obvously Kelly didn't fit the overall look he wanted to portray. That's It.
"You think you know... But you have no Idea..."