#3 The Undertaker (World Heavyweight Champion) and Michelle McCool (WWE Women's Champion)
The real-life relationship between The Undertaker and Michelle McCool was always kept off-screen by WWE, largely to maintain "kayfabe" and protect the Phenom's dark and supernatural gimmick. It was only recently that WWE portrayed a more humanized version of The Undertaker, with AJ Styles dragging Taker's wife into their feud this year at WrestleMania 36.
The Undertaker and Michelle McCool started dating sometime in 2007. It was in 2009 when both of them were champions at the same time in WWE. Michelle McCool won the WWE Women's Championship at The Bash in June 2009 by defeating Melina. In October 2009, The Undertaker defeated CM Punk at Hell in a Cell to win the World Heavyweight Championship.
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In the recently released WWE Network docuseries "Undertaker: The Last Ride", fans got to see how amazing their relationship is. The Undertaker even credited Michelle for his success and thanked her for all the sacrifices that she had made. With the Phenom seemingly announcing his retirement from WWE, the couple could now spend more time together. Unless he decides to come back again!