"We're still very close friends," Rossum, 24, tells USA Today.
The two were first linked in the fall of 2009 after they'd been spotted together multiple times. As a couple they remained relatively quiet, but Rossum did reveal she originally met Duritz, 46, through Twitter.
Rossum, who says she's single, split from her then-husband Justin Siegel in August 2009.
Next up for Rossum: her new Showtime series, Shameless, which begins in January. Says Rossum: "This is happiest I've ever been in my whole life."