Wait...explain this "unobtainable girl" thing to me. Are you saying some guys can't have whatever woman they want?

Ok seriously now. If she knows that she has that power over you, go hang up your dick. Let her know (through attitude not words) that you aren't influenced by her attitude. Either she'll be attracted to you or she'll realize that she has no power over you. It sounds like she needs to experience a lack of attention.