1. Why is Edward now willing to change Bella into a vampire (provided she marries him) after being dead set against it for so long?
I think he knows that she really wants to change and that she won't except no!! she will have it done...and he probably really wants her to have her way!! he also things his condition will help postpone things a bit, because she truely wants him to!
2. Why is it still so important to him that she marry him before he changes her? Is there more to this than a strategy to delay her?
I think both!! he explains he would have been "that boy" I think it is important to him - and a HUMAN thing she would not miss...but I also think he knows she doesn't want to approach her parents and actually do it yet, THAT is what he is hoping will delay things!
3. Why is Bella so panicked at the thought of marrying Edward? Is there more to her reaction than she is saying? Does she actually understand her own reasons completely?
I think she is worried about her parents, mostly ... she is willing to be with Edward forever in every way if she turns...marriage is a bit more human than she wants to be...plus, she doesnt' want to have to deal with her parents and a Day that surely would be ALL about Bella, not in her nature!
4. After the epiphanies of NM, how could Edward still imagine being immortal was more important to Bella than her love for him?
thoughts are thoughts, everyone has them, even the mosted loved could very possibly question others love - i can't say its human...since edward isn't - maybe a natural thing...he could just be triple checking!
5. Edward says that changing Bella is the most selfish thing he will ever do. Why is he nevertheless prepared to do it? Is this morally weak of him?
In his heart he loves bella, and he knows he wants her forever I think he fully WANTS to keep her forever and thus prepared to do it - besides the fact she has made it QUITE clear she will find someone that will if he doesn't! But at the same time, he really doesn't want to rob Bella of her human things...I think his actions are super sweet!! he really does seem to put Bella first, but still aches at what he wants as well!! what a delimma!