Elena: (referring to her resemblance to Katherine) You could have told me.
Stefan: I wanted to tell you.
Elena: You said no more lies, only the truth. I can handle the truth, Stefan. As crazy as it is, I can handle the fact that you are a vampire, and you have a vampire brother, and that my best friend is a witch. I can accept the fact that the world is a much more mysterious place than I ever thought possible. But this...this lie, I cannot take. What am I to you? Who am I to you?
Stefan: You are not Katherine. You are the opposite of everything that she was.