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A fake friend who laughs in your face but cusses you out behind your back
I told them I flunked math and they said 'whatever' but then I heard them say 'that idiot failed math' in the hallway.
They said they'd cover for me when I skipped class, but I heard them tell the teacher I was 'a lazy piece of trash'.
I dropped my phone in the toilet and they said 'no big deal' but I heard them say 'that clumsy bastard ruined my phone'.