"It was a very tough conversation, and it left the family kind of shaken up for a little while," Jonas said. "I mean, we were about to start a tour. We were two days from starting a tour."
Nick and his siblings, Kevin and Joe Jonas, dismantled their boy band in October 2013 after reuniting from a long hiatus. The brothers had been working on new music for a highly anticipated new album, but days before kicking off their comeback tour, they announced their split.
Days later, eldest brother Kevin told Good Morning America, "I think it was time, and for us it took some time getting there, but we feel like it's time that the Jonas Brothers come to an end."
Nick told Cohen that ultimately he made the best decision.
"We're good now. I have a beautiful niece. My brother has a family. Joe's band, DNCE, is doing very well," he pointed out. "It's good for everybody and it's good that it happened because I think we all grew from it, but it was very challenging for a little while."
The "Close" singer also dished on the relationship status of good friend Demi Lovato and Wilmer Valderrama, confessing that he had nothing do with their breakup and wishes them both happiness.
Cohen also brought up Jonas’ recent run-in with Liam Hemsworth, who is engaged once again to Nick's ex, Miley Cyrus.
"You and Liam were both on Fallon last night. On a scale from 1-10, how awkward was it being backstage with him?" Cohen asked.
"Not awkward at all," Jonas responded, which he noted it was mostly because the two didn't share any words.
Let's not forget that back in 2012, Nick wrote a song about Cyrus called "Wedding Bells," in which he sings about wanting to "try one last time" with a past love and not wanting to "hear the wedding bells chime."