"This was mutual," a source told People of the break-up. "They needed some time apart."
Julianne, 21, met Chuck, 30, while on tour with Brad Paisley in 2008, and the pretty singer said their first date was very memorable.
"Our first date – it was sushi and then a walk somewhere," Julianne told Access in 2008. "We can't tell you the rest 'cause that's kind of a personal thing, but… We've got all these sentimental things from our first date that are like, kind of everywhere."
After their first romantic outing, as the tour continued, the two seemed to live out of each other's pockets.
"We would go on dates everyday 'cause we would be on a new city," Julianne recounted to Access. "We would go hiking, we would go biking, we would go do all these different things — that's the adventurous side of him… We got to see like four different sides of each other every single day that usually would take people six months, eight months to really get to know."
And at the time, Chuck told Access he fell for not only Julianne, but her family too.
"I love her family, I mean just being around them… I fit right in pretty quick," he said. "I feel very blessed to be a part of it."
Both stars are expected at the CMAs on Wednesday night.