HELP ME IM SO UPSET! READ AND ANSWER LIKE YOU WOULD TO YOUR BEST FRIEND :(:( PLEASE?

if this is honestly how you feel, then the problem isn't with you you shouldn't try acting differently at all. i know you don't want to start a fight but try starting a conversation. tell her that you feel she acts differently toward you and has been really weird with this girl nina. start hanging out more with your other friends so she realizes that you could do well without her, she'll miss your friendship. ask her to go out for pizza or the mall one day something you guys can do just as besties so you'll both be able to see how strong your friendship is right now and you can see whether if she's really changed a lot.