In the book "Calypso" by David Sedaris, the author expresses a sense of betrayal, akin to discovering that a beloved pet has a hidden life. This sentiment arises from the realization that the cat, whom one assumes is loyal, is actually receiving affection and care from neighbors under a whimsical name like Calypso. This notion reflects a deeper theme of unexpected feelings of disloyalty and the complexity of relationships, even with pets.

Through this humorous yet poignant observation, Sedaris explores the vulnerabilities associated with love and attachment. The comparison of a pet's secret life to feelings of human betrayal highlights how we project emotional connections onto our animals, revealing the intricate dynamics of companionship. The use of a light-hearted name adds to the absurdity of the situation, combining humor with a relatable sense of loss.