I need you to answer please!!!!!!!!!!!?

ok so there are these 2 gurls call holly and amy. they have started acting all strange around us but usually they wont even *** near us. they have even gone to our head of year to gr over us. But the thing is y did they gr wen we did nothing and our head of yr (mrs osborne) said to holly what do u think sophie(me) yasmin freya and ellis (my friends ) hav dun and all she sed was ummmmmmmmmmmmm because we havnt dun anything wrong and we r in yr 8. why do you think they r doing this??