"They are at different points in their life now and have mutually agreed it is best," the rep tells Us. "LuAnn is upset, but it's amicable and they remain friends. Jacques has been a wonderful part of her life."
Housewives costar Kelly Bensimon also exclusively tells Us, "I love both LuAnn and Jacques and feel for them during this difficult time."
De Lesseps, 48, began dating the wine entrepreneur, 38, in 2010. The couple began talking about the possibility of starting a family together during the fifth season of the Real Housewives, which aired in summer 2012.
"My chances at this point in my life of getting pregnant are not good and I know it's not going to be easy," De Lesseps admitted on the show. (The reality star is already mom to two teenage children, Victoria and Noel, with ex-husband Alexandre de Lesseps. "It's definitely not like the first time I had children. I think Fertile Myrtle has taken a little wander into the pasture."
De Lesseps received the title of Countess from her marriage to French nobleman Count Alexandre. The two divorced in 2009 after 16 years of marriage, but the Bravo star has continued to use her royal title.
When De Lesseps began dating again a year after her divorce, she told Us she likes men who make sweet gestures. "It's about the intention behind the actions," she said. " It's about showing the other person that you really care and are thinking of them. It's about making someone feel special."