Should I stay alone?

I have a bestfriend girl, we was best friends since we born , always together , this year a girl came to study with us in the same class, m was uncomfortable for her, then she pretended that she love both of us nd both we mean for her as her bestfriend , now she took my bestie away, always taking pics without me, tags in Instagram, hanging out together... nd m tired of that shit
at the first my boyfriend warned me from this girl i dont wanna hurt her but i want my bestie back... what i should do
Should I stay alone?
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