She treats me like a stranger now. Girls, should I be bothered?

Wallflowered
Been friends with this girl for half a year now. We have been really close with each other. We talk everyday, she's kind of a clingy type, so we fall asleep on the phone together. And I've been always out lately with my friends, she waits for me to get home, and we started fighting. It's became a cycle. She then calls me best friend. But I think she met a guy now and fell in love over a week. And she barely talks to me. She didn't even told me about him, when I know she tells me everything. It's just really upsetting that she called me best friend when now that I try to strike a conversation she doesn't reply. Did I do something wrong? Because it feels strange that she treats me like a stranger now.
She treats me like a stranger now. Girls, should I be bothered?
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