Roberts, Peters split
Multiple sources have stated that the split was amicable, reports usmagazine.com.
As previously reported, the American Horror Story seasons 3 and 4 co-stars had reunited in August 2015 after calling off their engagement in June 2015.
Roberts, 25, and Peters, 29, got engaged on Christmas 2013.
The two started dating in spring 2012 after meeting on the set of their film Adult World.