Girls why do you think they do this? its very funny sometimes.?

ok...in cl i don't talk much but i know the girls like me. i know because they always say it amongst each other and most times i over hear them. but the thing is...none of them talks to me. except one girl. but whenever this girl comes to ma seat to talk to me, something funny happens, the whole cl turns to us and then all the other girls will come and seat beside me to talk to me also. but if i don't talk to her or another girl, none will talk to me. all they will say is hi cutie, hello henry. this kinda makes me think and till now i have not come up with a tangible reason. so i was hoping u girls could help. why do they do this? Surround me to talk only when i start a conversation with a girl.