If Scully had to choose between die right now and live for eternity, what do you think would be her choice?
She picks death.
Dana Katherine Scully believes that there is nothing to fear when this life is over, but that’s not why she decides to die.
She wants to pick living forever–not for herself, exactly, although not not for herself, but mostly for Mulder. She doesn’t want to leave him alone for the rest of his life, and anyway, somewhere inside, she doesn’t really believe that living forever is possible. If it is, she’s sure she’ll find a workaround.
But then she remembers that Mulder would know, he’d have to know, if not right now or tomorrow or even in five years, that she made that choice for him, because she wouldn’t be aging with him. And as much as he’d like the idea of never having to conceive of a world without Scully, he’d never be able to bear the guilt. He carries too much of that already. She can’t make him watch her stay the same age when he always saw his sister in pigtail braids, perpetually eight years old. She can’t be someone else who slips out of his grasp.
And, selfishly, she doesn’t want to conceive of a world without Mulder.
She tells him all of this and he tells her it’s okay, he agrees, she did the right thing, and he closes her eyes