The Big Bang Theory

Will Truman and Grace Adler, "Will & Grace"

As neighbors in their dorm at Columbia University, Will (Eric McCormack) and Grace (Debra Messing) dated and were even engaged before Will realized he was gay. Years later, Grace moved in with Will in New York after dumping her fiance ... more at the time. The best of friends, the roommates finished each other's sentences and approved (or disapproved) of each other's outfits and boyfriends. Many, many years later, Grace's daughter and Will's son would meet in college and then marry.

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(NBC)