If the girl you're hooking up with in private doesn't want to be seen with you in public, then you shouldn't be hooking up with the girl. Cameron identifies as a nerd (he is, it's okay) so superstar Karla doesn't want to be seen publicly with him. While the preview doesn't go far enough to show why the two hooked up in the first place, it's clear that Cameron has some reservations about the relationship, understandably so.