next girl that ignores you or anything slap her there and then, its well funny for the guys to watch
erm nah id say just let it be, it happends alot at college i think, erm there is about 9 of us most the time together, messing around, laughing, joking, taking the piss out of the rude boys :P and sometimes you can actually tell someone is being left out but do nothing.
sometimes me and one of the others go off and leave others out, sometimes it happends to you, its all one big circle, in a week or so one of the girls would fade out and it will be you and the other one, then this chick is in the same position you are
its how it works

i hope LOL