Nate Ruess has to "get used to" his girlfriend when he gets back from touring.

The fun. singer is dating fashion designer Rachel Antonoff, the older sister of his bandmate Jack, who is in a relationship with Lena Dunham.

Nate, Jack and third member Andrew Dost toured to support their 2012 smash hit album Some Nights. They had some time off before taking to the stage again this month to perform at the Final Four in Dallas.

"After doing this for three-straight years, I've been thrilled about getting some time off. So my feeling for the Final Four show was kind of like, 'Gosh, I can't believe we gotta do this,'" he laughed to Rolling Stone. "It's always weird going back… the same thing used to happen when I'd go away on tour. When I'd come home, my girlfriend and I would have to spend a week getting used to each other again."

This year, fun. announced they are working on a new album, which currently has no name or release date. Nate was very aware that he didn't want to rush the new work.

"It's moving. There's an apprehension at first, because I don't want this thing to move too fast, because I want to be able to enjoy being at home," he said. "And with this album – and after being on the road for a few years – you can't help but think of how each song is gonna fit. You start thinking about what you're gonna want to play, and what you're gonna want to say."

The 32-year-old admits that during his time off he has mainly been golfing. Despite loving the time to relax, Nate did feel "good" when he was reunited with his bandmates.

"That's about as sincere as it gets," he laughed. "But it also showed me that less is more. Between me, Andrew and Jack, we're the kind of people who think anything worth doing is also worth overdoing, so I want to find a balance."