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A fake friend is someone who acts like they give a damn about you, but they really don't. They just want to be cool and laugh at your problems when you're not looking.
'I miss you!' she said, then went to the mall with her ex and forgot about me.
'You're so ugly!' she told me in front of the whole class, then went to lunch with her bestie.
She said she'd help me with my math test, but she was with the popular girls the whole time.