I contend that you'd learn an awful lot more about love and relationships from a novel like Madame Bovary or Anna Karenina, than you ever will from 'non-fiction' like The Game (which you've mentioned up-thread).

Drawing a clear distinction between fiction and non-fiction is in my opinion pointless - you can tell any story you like by using selected facts, you can tell multiple stories with the same facts, and people often do twist the truth when reminiscing and celebrating the past, or present the truth from a very limited, insular point of view in so-called non-fiction books. So in this sense I see non-fiction as very similar to fiction; it's used to tell stories, to present the world as the author sees it, and to educate and entertain. All of these functions are performed by both fiction and non-fiction, and in both cases we're trusting the author to tell us something about the world from their perspective.

The best stories (be they memories of a real-world event, or imagined events based on life experience) transcend the particular and become lessons about human behaviour and life.