Literary Theme: Love part two
3. Unrequited love: The pain of loving someone who does not return your affection. E.g. Me Before You, The Phantom of the Opera by Gaston Leroux, The Sun Also Rises by Ernest Hemingway, The Catcher in the Rye by J.D. Salinger, Notting Hill, The Great Gatsby
4. Friendship: The power of friendship to carry people through hard times and change them—whether for better or worse. Common in young adult literature. E.g. Harry Potter, The Lord of the Rings by J.R.R. Tolkien, The Secret Garden