A girl that might act like your best friend at first, but if she really likes you, she eventually wants to be you. She's an actual psycho, so Emily then takes steps to insert herself in your life way too deep in the creepiest of ways, and proceeds to stab you in the back by trying to steal your man, and blames him for all of it if she fails. She gets defensive about it and acts like she did nothing
wrong when confronted. She leaves your life as quickly as she
came in and ruined it when told to
fuck off, and calls you the horrible person. But
actually, she's happy to lose you, because Emily can't wait to move on to the next friendship and do it all over again.