"That's part of being a musician, I guess. You write songs about each other," Joe said of Taylor, who he dated in 2008.
Despite dating and their subsequent breakup, Joe said he and Taylor are on good terms.
"She's great. Yeah, we're friends," he said.
Adding, "In this industry you meet a lot of people and you stay in touch. Obviously, it's tough to be friends with people that are always constantly traveling, but yeah, we're cool."