“Their work kept them apart a lot,” an industry source tells PEOPLE exclusively. “Chicago Fire keeps him in Chicago and her work is almost always elsewhere.”
PEOPLE confirmed the longtime couple – who have been dating for five years and got engaged on Valentine’s Day last year – split earlier this month. After a PDA-filled awards season, Kinney and Gaga were last photographed together in April.
Gaga, 30, opened up to Howard Stern on his radio show in 2013 about how she and Kinney, 35, made their long-distance relationship work.
“We don’t have any rules about calling each other at certain times … We’ll go days at a time without talking and then we’ll talk every day,” she said. “He’s on his journey and I’m on mine and we’re gypsies. And then when we’re together, we’re really in love and that’s it.”
The singer is currently in Cabo and is no longer sporting her unique heart-shaped Lorraine Schwartz engagement ring. The star shared a video on her Twitter page Monday of herself singing her hit “Born This Way” to children at a foster care in Mexico.