Choices Quotes in New Moon

In this moment, Edward defines being "human" by not being a killer. Is that an adequate description? What’s the definition of being "human" throughout the entire novel?

Might this mean that Edward’s always had one foot out the door?

Edward believes that he’ll be able to disappear out of Bella’s life, leaving no physical or emotional traces. Does he truly comprehend the consequences this decision will have for both him and Bella?