Elena: Not anymore?

Stefan: There was a time when this town was... very much aware of vampires, and it didn't end well for anybody. That's why it's important that you don't tell anyone.

Elena: I can't promise that.

Stefan: Elena... Give me today.I will answer any questions that you have. And when it's over, you can decide for yourself. What you wanna do with what you know. It'll be your choice.