“I have many regrets about that relationship,” Nikki Bella, 36, writes about her six years with John Cena, 43, in Incomparable, a new memoir with sister Brie Bella. In this tell-all, Nikki discussed how her unresolved issues with her father abandoning her at age 15 affected her relationship with John, and how it took a stint on Dancing with the Stars (where she would meet future fiancé and father of her child, Artem Chigventsev) to snap her out of it.