Passion Memory and The Past Quotes

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Quote #4

She hardly realized it was time to say good-bye. As a matter of fact she does not know to this day if those words were spoken. (301)

How does the inclusion of a spoken good-bye change Grace and Neil's final moments together? How about the absence of a good-bye? It sounds like Grace has been carrying around some unfinished business with Neil all these years after that fateful night.