Hilton's publicist declined to comment on the story.
However, one insider told UsMagazine.com, "They are broken up."
"It's sad, she cares about him a lot and thinks he's a great guy but they really hit a rough patch," the source added. "[Cy's] found it difficult to live his life with her in the spotlight and that's what caused their split. No drama, it's amicable, but things didn't work out."
Notable deaths of 2014 [PHOTOS]