Seth
You know, he might have a fighting chance with any other girl if Lily Potter wasn't following him around. Sure, she was a good snog. But it was a one time thing. Just one of those things that happen at parties. And now she's following him around, giggling at everything he says, and nothing he does makes her go away.
So he finds a hot girl, wraps an arm around her waist, and kisses her. Just so Lily will get the message.