Black Mirror The Entire History of You explained: What happened in season 1, episode 3?

BLACK MIRROR episode The Entire History of You explores the nature of memory and what it would mean to be able to access past moments at the touch of a button. First airing on Channel 4 back in 2011, the episode has lingered in the minds of fans – but what happened in the episode and what were some of the most revealing moments?
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