If あなた say EdBella's 愛 is infatuation, do あなた think realistically it would last beyond Breaking Dawn?

Sadly, I think it would last because of two reasons:
1) Reneesme (I have no clue how to spell her name)
2) They're so infatuated with each other that it isn't until they actually fall in 愛 with someone else will they realize what they have is lust, not 愛 (and there is quite the big chance they won't fall in 愛 with someone else, または admit to it, because the other would probably commit suicide, and who wants to have someone's death on their hands?)

Most relationships start out as infatuation, progress onto lust, then evolves into love.

They already went through that process, so yes.

Maybe. Maybe if either Bella and Edward develop as a person, then they'd fall out of love.