Article continues below advertisementHaylie Duff's relationship once looked like a modern love story that didn't need a traditional ending. Engaged to Matt Rosenberg for 12 years, the actress often spoke openly about why the couple never made it down the aisle. Now, their quiet split is putting a spotlight on a growing relationship phenomenon: the long engagement that never quite becomes a marriage."We didn't plan to not get married, we just have been busy having kids and filming shows and him working," Duff said in a 2021 interview with Access Hollywood.