What's going on? And why are they acting like this?

my two best friends are allie and lindsey. allie never talks to me. actually on wednesday we saw each other in the bathroom and she asked me how the philosophy test was. anyway. i stopped sitting with them because when lindsey and allie are together, it's like i'm not even there. but when lindsey isn't with allie, we're like best friends. except she only tells her secrets to allie. so i started hanging out with chloe. she was upset because her best friend natasha wasn't talking to her, so for 2 weeks chloe and i were hangin out and stuff. but then natasha and chloe are friends now, and she ignores me a bit, and i feel like i have no friends, and i dont know what group i'm in, and i feel hurt, rejected... ugh!! lindsey told her secret to our philosophy teacher today, and not me! i was so hurt. dont tell me to confront anyone or leave anyone, cuz i wont listen. i need something else. please help