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The Most Heartbreaking Star-Crossed Lovers In TV History

1. Lady Mary Crawley & Matthew Crawley, 'Downton Abbey'
"I will love you until the last breath leaves my body," Matthew once said to Mary, and that's exactly what transpired. After watching their tenuous relationship (which was overwrought with sexual undertones) evolve into a full-fledged romantic fairytale, things took an unexpected turn when Matthew was unexpectedly killed in a car accident.