It was Sarah, 26, who made the decision to end her relationship with the Shadowhunters star, Entertainment Tonight confirms.
A close friend of the former couple told the publication that the relationship had "simply run its course" but the TV stars will remain friends.
In February this year, the Modern Family actress shared a snap of the pair in celebration of their two year anniversary, writing:
But in the months following the post, the pair were reportedly on the decline and have finally called it quits.
At least they made a clean break and didn't go out publicly feuding like *certain* other couples.
R.I.P. to one of our fave celeb couples of all time :'(