The split, however, was reportedly amicable, reported Us Weekly.
"They just found they were better off as friends and wanted to support each other's careers," a source said, adding that the former couple's busy schedules were partially to blame for the breakup.
Lea's romance with Robert may be over, but their professional relationship isn't.
They are co-stars on upcoming Hulu sci-fi drama "Dimension 404".
In mid-June, Lea, 29, shared some set photos of her and Robert.
Also Read
Just a few days ago, Lea spent her Fourth of July weekend with Robert and some of her friends, including her former "Glee" co-star Becca Tobin.
Prior to her relationship with Robert, Lea was dating Matthew Paetz for two years.
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