1) Revolutionary Road - If Nicolas Sparks' sappy novels make you wish you could find that "special someone," this book will do the opposite. It shows a couple that married young and over time the partners have grown to loathe their spouse and all the responsibility that goes with having a family.
2) Tara Road - To me this book was about discovering that love can hurt you, and ending up with "Mr. Right" is the worst thing that could happen to you.
3) The Great Gatsby or Anna Karenina - in both books falling in love leads to the rampant unhappiness of the lead characters and eventually to someone's demise. That's definitely enough to make me a bit wary of love.
Photos from around the internet, credit where it's due.