The blonde beauty has been linked to the restaurateur since last August (13), but it seems their romance has now fizzled out, a source tells E! News.
The insider reveals Agron "dumped him a month ago," but did not divulge further details on what led to the split.
Agron kept their relationship fairly private and they were only photographed together a few times.
She previously dated actor Sebastian Stan, James Franco's younger brother Dave Franco, and her I Am Number Four co-star Alex Pettyfer.