ARCH-NEMESIS — How Husband and Wife Become Enemies Over Time examines the quiet psychological process by which intimacy can gradually turn into resentment, hostility and emotional distance. It explores how familiarity changes perception, how small injuries accumulate, how memory becomes an archive of grievances, and how unmet expectations, attribution errors, scorekeeping, defensiveness, contempt and old wounds can transform a partner from someone we love into someone we experience as an adversary. The book is not about blaming either spouse, nor does it suggest that love inevitably becomes resentment. Instead, it asks a more unsettling question: how can two people who once knew each other by heart gradually become the central antagonists in each other’s psychological world—and, once that happens, whether understanding can still make a different future possible.