Don't Let Me Fall

I want a girl I can't have. She's my tutor. My best friend's girlfriend. And my kryptonite. She also looks really good in my T-shirt. But she wants the golden boy, and I'm more of the villain type. Or at least I was.... Until I saw her smile for the first time. But the good guy she wants wouldn't lust after his friend's girlfriend. And the good guy she's with sure as hell shouldn't be sneaking around behind her back. So where the hell does that leave me?