Before Bella jumped off the cliff in New Moon we know that Edward was going to come back "just to check on her".
1. How do you think Edward would handle smelling a werewolf on Bella? (Edward promised she would never see him again, is this "cause" to break that promise)
2. Do you still think that Edward could "walk away" if he knew that Bella was "involved" with a werewolf? (Would it matter if it is a friendship involvement or a romantic involvement?)
-- If he walks away, does he walk away without her ever knowing that he was there?
3. How do you think that Jacob would react to smelling a vampire "near by", with two situations.
a) He would not know it was Edward (because Jacob has never smelled Edward with his "wolf" nose) but just a random vampire.
b) Just for argument, how do you think it would change if Jacob knew it was Edward he was smelling.
** Let me clarify on Bella's side. She does not know Edward is "around". I pictured Edward's "visit" probably be in in the middle of the night while she is sleeping. But he would still be able to smell werewolf on her clothes, and if he happen to be in her house (like when they did homework) then Edward would be able to smell him around the place.