"Sarah's doing fine. It didn't work out," a source tells Us. "She's young. They decided they would be better off as friends." (Tellingly, Hyland showed up at the Emmys on Monday, Aug. 25, without a date.)
Hyland, 23, first met Prokop, 24, while auditioning for High School Musical 3: Senior Year in 2008. They later starred together in Disney Channel's Original Movie Geek Charming in 2011. During their relationship, the couple lived together and co-parented dog Barkley Bixby, a 4-year-old Maltipoo.
Last November, the Modern Family star gushed to Us that her favorite date night with Prokop was of the casual variety. "I'm not a really fancy girl, I like something really simple," she said at the time. "As long as thought was put into it, that's all that matters to me."
The actress may be low-maintenance, but Prokop said that he had to try hard to sweep the ABC star off her feet. The couple dined at Mexican restaurant Casa Vega in L.A. for their first date, where they instantly clicked. "I think we both realized it when we were cool with just hanging out in sweatpants together and didn't have to think about what we were going to do," the actor told Seventeen magazine in October 2013. "We were both there for the right reasons. It just felt so natural!"