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 that he knows that she will find someone to do it anyway, even if he was still dead set against it. I think that if Bella was going to be a vampire, Edward would prefer it to be him who changed her, as that seems much more...romantic? But at the same time, partly cos of the time he grew up in, he doesn't think it's right to do something so personal without being married. Which is actually incredibly sweet of him I think.
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 don't think it's to delay her. He knows that she could get Carlisle to do it if she wanted. I think he thinks it would be "right" if they were married first. He wants the connection of being married. If means a lot to him, as he is that boy.
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 panicked because she is embarrassed. She doesn't want to have to tell people (esp. her parents & her school friends) as she assumes that they will assume she is pregnant. Like she says, times have changed, and people don't generally get married straight out of high school. I think her reasons, while valid I suppose, are a little silly. And in exchange for Edward turning her, I think she is getting a good deal!
4. After the epiphanies of NM, how could Edward still imagine being immortal was more important to Bella than her love for him?
I don't know. I guess cos he feels she could do so much better than him, and maybe the reason she is with him is not cos she loves him, but cos she wants to be immortal. Actually I think that isn't true; I think he must know she loves him and wants to be with him forver because he is Edward, and nothing else.
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?
Because she will find someone else to do it anyway! As much as he think it's the most selfish thing he'll do, he still wants to do it. He wants to be connected to Bella in every way possible. It is not morally weak of him; she will find a way to become a vampire at some point anyway. But it would mean so much more to Bella, and Edward, if he were the one to do it.
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