Why would she just stop talking to me?

Bubbles16
So in elementary school I had this friend who I'd prefer not to name so I'll call her M and all through elementary school we were best friends but once we got to middle school she just stopped talking to me for some reason and I don't know why because I never did anything to her to make want to stop being my friend
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And I should mention that she's only spoken to me 3 times in the past 7 years
Why would she just stop talking to me?
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