Friend issues!!!?

well im moving to a new school and now i find out that mi old friends have been talking about me behind mi back except this one girl who ill call gerard and well gerard is the one that told me..... and im trying to ignore and pretend that it neva happened but i just cant and mi old friend who was talking about me now sends me messages saying "omg... im so gonna miss u..... "and"i miss u so much"..... but mi friend amanda invited all of us to her party and then mi friend who was talking about me said said to "gerard" that she wouldnt go if i went because i was like annoying or something and then all this other stuff...... then billie i think is trying to make me jealous...she always messages everyone else on her friends list but me and then she is always trying to talk to mi other friends and when i come around she either walks away or just gives me a dirty look and then turns all sile!!WHAT AM I SUPPOSED TO DO? i have no idea whats going on!! HELP PLZ... and plz no rude comments!!