well get the confidence to confront her and tell her how you really feel.
first try to tell your friend that you feel mistreated, and if they dont take that, then give it sometime, and try again. if it seems to not work, then maybe they dont want to be your friend anymore.
Tell your popular friend if you don't become his girlfriend you will not be friends with her anymore >:)
You should just move on with your life and become friend with someone else and just that best friend that is not your friend anymore>
That's a tough situation it has happened to me many times. If you do want her to be your friend and your not happy about the way she is treating you i would suggest to do is too talk to her about it very quietly and be mature if she is not don't stoop to her level just talk to her again some other day. xx
Be very careful what friends you kick out of your life or one day you could be the one that is kicked out of a friendship. If the person is not treating you in an honest and good way then tell them the truth to their face and tell them the friendship is over. Don't trade off loyal friends just to fit into another group that is more popular.
You can impress you childhood friend by treating her well.
You could say politely "I don't think we have that much in common anymore, therefore I don't want to be friends with you anymore."
Tell them that you dont want to be there friend anymore
Then don't be his friend anymore.
You have to move on and look for other friends.
If you have a friend who is controlling who you date, you need to get rid of your friend.
you just cut them off and not talk to them any more