Gray Area Girl
The girl who cares about a guy and thinks that the guy cares back, until she realizes he's commitment-phobic. But then, he turns around and has a relationship with some other girl, and the gray area girl soon realizes it was her fault because she didn't speak up. What meant so much to her, meant nothing to him.
Sara: "I thought he was the one. He said he wasn't the commitment type, but now he has a girlfriend and it isn't me."
Beth: "Sorry Sara, it seems like you were just the gray area girl."
Beth: "Sorry Sara, it seems like you were just the gray area girl."