Books that you enjoyed but were so emotionally devastating that you would never want to read again?

This girl I knew once invited me and a few classmates to her beautiful home where she had a library and she showed us that she got a shelf there for books she enjoyed but does not intend to read again.

There were a few dozen books there, fiction, nonfiction, memoirs, and so on. The first book in that shelf I recognized was Les Mis, the novel by Victor Hugo. She said she identified too strongly with so many characters, but especially Jean Valjean and Cosette, and reading the story was both deeply pleasurable and simultanously one of the most painful experiences she had.

I was recently thinking about that experience, when somebody mentioned enjoying the movie Dancer in the Dark but not wanting to watch it again.

So that is my question to the community, what's a book that you liked the first time but now would find it too tough to read again, too emotionally exhausting?