It is possible there is a bit of jealousy going on with you towards your friend as you had no right to question the new friend as to whether she really was your friend's friend or not. Keep out of it and let your friend find out for herself.
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girl friend is a friend that is girl and not a best friend
and girl friend is best friend
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If your friend was whispering to your other friend about what
you did to your best friend on accident, it means that friend likes
to gossip and stir the pot, causing trouble. Maybe this whispering
friend isn't really a friend at all.