The 30-year-old socialite and her Las Vegas club owner boyfriend - who were last week said to be "re-evaluating" their relationship - have reportedly made the decision to part ways because he cannot cope with her celebrity lifestyle.
A source told US Weekly: "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.
"Cy 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."
The pair have been dating for over a year and a half, but Cy was said to be particularly upset by their private lives being shown on her new reality TV show `The World According to Paris`.
An insider said: "Cy is very upset with the series. He felt that way too much of their private life was shown. When he signed on to do the show, he had no idea the cameras would be so invasive."
Speaking about their relationship previously, Paris revealed she would get engaged on her new series if Cy asked.
She said: "We are so happy. It`s almost been a year and a half now so we`ll see what happens, but the show is going to show everything, so when that happens it will be on the show."