She's living with Edward for forever. That's the whole point isn't it? She chose him. He's who she can't live without. And with him, comes being a vampire, which comes with forever. That's what she's wanted throughout the entire series.
I don't think she'll get bored. She had 3 Книги to chose her decision and she finally made her decision in Eclipse: to be with Edward... for eternity. I think she thought it through pretty thoroughly wouldn't you?