Backstabber.
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Noun, (plural backstabbers) A traitor or hypocrite, such as a co-worker or friend assumed trustworthy but who figuratively attacks when one's back is turned.
Backstabber, one of the best ways to describe... Her. Who is this her? Rachel. Or as we call her, the back stabbing bitch. Why is she a backstabbing bitch? Well let me just give you a brief run down, she literally broke up a couple and went with the guy straight after.
So yea, that's it, but I might as well explain everything in detail.