The 39-year-old singer and 'X-Factor' judge had a seven-year on/off relationship with the Formula One ace until 2015.
She told Fabulous magazine: “As women, we tend to love the other person and give everything to them.
“But sometimes the other person - the man - tends to be quite selfish, so they’re thinking of themselves and doing what’s best for them.”
Lewis admitted his relationships come second to cars: “My cars are my babies.
“I used to say, when I had a girlfriend: ‘I’m taking one of the girls out, so you can come if you want, but you come second when it comes to the cars’.”