Read the following passage:
He fell into bed and his wife cried out, startled. He lay far across the room from her, on a winter island separated by an empty sea. And suddenly she was so strange he couldn't believe he knew her at all. He was in someone else's house, like those other jokes people told of the gentleman, drunk, coming home late at night, unlocking the wrong door, entering a wrong room, and bedding with a stranger and getting up early and going to work and neither of them the wiser.
According to the narration, why is Guy bothered?