The singer and cyclist broke-up in 2006 after three years together and Sheryl adopted second son Wyatt in 2007.
"I guard my private life ferociously. The last experience that I had (with Lance) was so public, and it was not an experience that I want to go through again. So I really keep my private life extremely private," the Mirror quoted her as saying.
"I don’t show up to places with my relationships because I don’t want to invite that in again," she added.
Sheryl, who is promoting her latest album 100 Miles From Memphis, said: "I live my life extremely normally. We live in Nashville now. There’s no paparazzi and that part of my life doesn’t exist down there, so we live a very basic, normal life, and I can have relationships that are completely out of the public eye."
