Hotel Covers Bill For Visiting War Veteran

Captain Lillyman enjoys a luxurious dinner with champagne, steak, and lobster, followed by dessert. Despite the lavish meal, he humorously notes he is a captain, not a general, and inquires about the cost. The meal is a stark contrast to his usual K rations and powdered eggs. At the end, he calls for the bill, which amounts to $554.12, but is surprisingly covered by an angel, making it a dreamlike experience.

What does the phrase 'all good things must end' imply in the context of the text?

Who is responsible for paying the bill according to the text?