[Her main block here isn't a lack of self-confidence, but her firm belief that Petre only likes boys. It's a black and white view of sexuality, but she's never had reason to stretch hers very far (or explore it much at all), and he mostly tends to bed boys as far as she knows. So he must be gay, right?]

You - wouldn't want Bobby. [Slowly, trying to puzzle it out with her eyes narrowed.] He's hot, but way too boring for you. And if you did, you wouldn't ask me permission anyway.