All The Myriad Ways by Larry Niven

In a world where parallel universes are a reality, the story explores the psychological and societal impacts of infinite possibilities. As people grapple with the knowledge that every decision spawns countless alternate realities, a wave of existential despair and chaos ensues. The narrative delves into the human psyche, examining how the burden of limitless choices can lead to a breakdown in moral and ethical structures, ultimately questioning the very nature of free will and destiny.