Are you your best friend's best friend??

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I have a best friend, a girl that I've known my whole life. She is the first one that I call when I'm in trouble and the first one I share my juicy gossip with. However, I don't think I'm her best friend anymore. My friend and I grew up together but our families moved apart from one another and she became close with another girl. I'm pretty sure that other girl is now my best friend's best friend. Confused yet?? If not, then are you you your best friend's best friend? Or does she just consider you a regular old friend now?? Please share!