"Who's taking care of Auri now?
Like. that bothers me. She's sweet, and innocent, and needs him. Something happened that was bad enough that he left her."
I keep wondering if Auri is actually dead, as in something terrible happened and Kvothe couldn't save her.
From the Harry Potter movies, the heartbreaking thing was when Harry finally found out that Snape had spent the rest of his life in love with Lily. From the books, the most heartbreaking moment for me was when Fawkes left Hogwarts and there was no more phoenix song---it just seemed like so much of an ending that by the time Fred died I wasn't really aware that that had even happened.
How about A Tale of Two Cities when Sidney Carton gives his life for Charles Darnay because of his promise to Lucie?
Or the elves leaving Middle-earth at the end of The Lord of the Rings, along with the moment I realized that Galadriel was from the West instead of being raised in Middle-earth.