Here's how Roseanne season 10 episode 5 reunited Darlene and David. Roseanne was a landmark sitcom that debuted in 1988 and starred Roseanne Barr, Laurie Metcalf, Sara Gilbert, and John Goodman (Kong: Skull Island). The show followed the trials and tribulations of the working-class Conner family, and it could be both hilarious and heartbreaking at the same time. Roseanne originally came to an end with season 9, which closed the show on a controversial note. It initially appears the family has won the lottery and the main characters work through a lot of their emotional issues, though the finale reveals the entire season was written by Roseanne Conner as a way of dealing with Dan's death following a heart attack.
Roseanne was later revived for a tenth season in 2018, which retconned the events of season 9 by pretending Dan didn't die after all. While the revival premiered to great viewing figures, it was later canceled following controversial comments by Roseanne Barr on Twitter. ABC instead created a spinoff called The Conners which picks up following the death of Roseanne's character, with the family having to move on with their lives in the aftermath.
One of the major relationships of Roseanne involved Darlene (Sara Gilbert) and David (Johnny Galecki). These two characters were teen sweethearts but their relationship was far from smooth, with the couple breaking up multiple times. The finale of season 9 revealed Darlene was actually dating David' brother Mark, while David was dating Becky. Since season 10 retconned this out of existence, that allowed the show to chart a different path, but Galecki's commitment to The Big Bang Theory meant his involvement with the revival was always going to be limited.
In keeping with the grounded nature of the show, things between them didn't quite work out. Roseanne season 10 episode 5 "Darlene v. David" reveals David left Darlene and their children to do humanitarian work following the death of his brother. David has moved back and comes to Darlene to ask for a divorce so he can be with his new girlfriend. Darlene and David then spend the night together and plan to reconcile, until Darlene comes to her senses and realizes they've grown too far apart. Their children also hate David for abandoning the family, so they agree to move ahead with a divorce.
Roseanne season 10 episode 5 proved to be a melancholy ending for the Darlene/David romance, but that could always change in the future. With The Big Bang Theory recently ending after 12 seasons, maybe Johnny Galecki will be able to appear more frequently in spinoff The Conners and their fraught love story can continue.