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A heartbroken man, reeling from his fiancée's departure, purchases an advanced AI computer, the Omni 5000, hoping to analyze his past and figure out what he could have done differently to save the relationship. He feeds the computer various scenarios, changing key events in his past, only to discover that no matter what he alters, his ex-fiancée, Emily, always ends up leaving him for her ex-flame, Chad. This leads him down a spiral of obsession and despair, culminating in a realization that he's been using the computer as a crutch and needs to move on from the past. Ultimately, he decides to return the computer and focus on his own personal growth. Comparable works include The Time Traveler's Wife