Diggs met Menzel while working together on the set of the Broadway production of "Rent" in 1996, per People. While the exact date of the beginning of their relationship is unknown, Menzel accompanied Diggs to the premiere of "The Best Man" in 1998, and the pair appeared to be dating at the time. Five years later, the couple married in a private ceremony in January 2003 in Jamaica, as reported by Us Weekly.
In 2005, Diggs and Menzel reprised their roles as Benjamin Coffin III and Maureen Johnson in the film adaptation of "Rent." For the next four years the couple pursued their own work projects, and by September 2009, they welcomed their first and only child, Walker Nathaniel Diggs. Shortly after the birth of his son, Diggs praised Menzel for being a mother, saying (via People), "I have a newfound respect and admiration that borders on worship of my wife . . . Just to see her turn into a mother overnight is amazing."
Four years after they welcomed their son into the world, Diggs and Menzel parted ways. The couple announced their separation in December 2013, emphasising their son as their main focus and priority. Touching on his divorce and the adjustment in his family dynamic, Diggs told Redbook in June 2014, "Right now, we're still trying to figure out a lot of stuff because we're on different coasts and our son is getting older."
Despite their split, the pair appear to be on good terms. In September 2021, Diggs praised Menzel for her performance in James Corden's "Carpool Karaoke," writing, "That's my baby mama……" along with a clip from the show on Instagram.