Guy problems help please?

ok so there is this guy and he is a sk8er but not like the preppy ones and then there was this girl who just moved here like a few weeks ago and she is lik reallly preppy and she is wearing wannabe skater shoes just to impress him and they r pink and from roxy so not even a real brand so yea and she is sooo falling all over him and its making me kinda mad she is really bratty and stuck up too and the guy tends to sit on ppl smetimes hes just strange like that most people just push him off and she just lets him sit on her also at lunch ther is never any seats at that table cuz their group is sitting there including me and she goes over there and either takes my seat or shares one with him and i feel that she shouldnt be sitting there at all and neither does his group and i know this shouldnt bother me but i does advice plz?