A tragic moment for "Twilight" fans all over the world! Fans were overjoyed when Rober Pattinson and Kristen Stewart's relationship was officially announced in 2009. It was a sad day for fans, when the news broke that Kristen had cheated on Pattinson with director Rupert Sanders. This tragic love story is more than worthy of being number 7 on our list. We never thought that our next couple's relationship would end in ruins.