How could you do this?!

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One of my friends was telling me this story. A friend of theirs told their best friend a personal secret about themselves. This girls best friend then turned around and told loads of other people! How could you do that to your best friend?! I could never do that to mine! And i know that my best friend would never do that to me! Would you do that to yours? What advice would you give this girl? Obviously she is very upset. Shes lost her best friend and now everyone knows her secret!