My best friend became popular and left me?

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Happens to almost everyone, just find new friends. Join clubs, meet friends through your other friends and try and be outgoing in class and stuff but at the same time focus on school. But... if you really want her to become your friend again call her and start a conversation and like ask "Why don't you ever talk to me anymore" or something... Now that may not be the best move but you can always try. And also another possibilty is try and join the popular group, don't make it so obvious but like if you have classes with them and they sit close to you try and start a convo or ask questions or something.