Following her breakup from Misa, Kacey eventually fell for country singer Ruston Kelly after meeting him at the Bluebird Cafe in Nashville in early 2016. She wrote her hit love song "Butterflies" about their first interaction, and most of her Golden Hour album is inspired by their relationship. The couple got engaged on Christmas Eve 2016 and tied the knot in October 2017. In July 2020, the couple announced they were getting divorced.
"We've made this painful decision together — a healthy decision that comes after a very long period of trying the best we can. It simply just didn't work," the statement read. "Though we are parting ways in marriage, we will remain true friends for the rest of our lives. We hold no blame, anger, or contempt for each other and we ask for privacy and positive wishes for us both as we learn how to navigate through this."