Help need advice?

ok my friends have been acting weared around me like giveing me dirty looks and not talking to me and keeping me out of the loop i have no idea why and now there doing to me and one other girl thats one of my best friends i saw one of the girls at the mall and she said that she wants me to sit with them agin because i haven't been i said why would i sit with people who dont like me she said i like you so now im really confused please help me