"Just hear me out!" Rose grabs your wrist before you could storm off in anger. "Please, let me talk." What else is there to explain rather than she used you for her own goal and was about to throw you away at the end? What else is there to tell? She became your friend, she made you think she's your friend, just to use you. Isn't it all? Maybe Rose did feel some friendship, perhaps she's feeling guilty, you are a nice person, anyone –or not– will feel guilty after playing with you.