Why did he leave

In new moon the movie when edward leaves he says the means thing in the world he should oh let her come with him but he neather did why i know that he wants to protect her but what if vitora finds her and kills her what is she soppose to do that is why they should of just changed her and touch her to with him i dont know bloggers but what do you think i mean this would me a hard love to keep so you tell me bloggers i mean all of my blogs are asking you bloggers what are you think..........