Wow, I love this so much. It's the fantasy of being unattractive and yet getting to have someone everyone wants. It's the possessiveness over that person, as if by being the only one who they can be normal around, you get one over them for having so much more attention. Of course, the princeliness may not be an act at all, and the other girl may be trying to hold onto someone that she's afraid is beginning to move past her.