The actress and the iZombie star were first reported as a couple in May, and sources confirmed their split on Thursday.
A source told the outlet that the two remain friends.
"[They] just found they were better off as friends and wanted to support each other’s careers," the source said, adding that the pair's busy schedules also contributed to their split.
Michele and Buckely were recently together filming Dimension 404, an upcoming Hulu sci-fi series where they play love interests, with each actor sharing photos from the show's set to social media.
"So much love for this amazing group of women, their patience with me has been unbelievable," Buckley wrote next to a photo of some of the show's cast and crew.
A photo posted by Robert Buckley (@robertearlbuckley) on
Michele also shared a snap in June of herself and Buckley in between shots, writing, "Just us and our very subdued director."
A photo posted by Lea Michele (@msleamichele) on