The Girls Aloud star ended her four-year marriage in 2010 after a string of allegations about the England soccer star's infidelity, reported Daily Mail.
"It takes a long time after you've been with someone as long as I was (with Ashley) not to feel like you're cheating on them. That may sound crazy, but it's the way I felt after him. I had completely committed myself," she said.
The 29-year-old singer also says she was left fearing she would never fulfil her dream of becoming a mother after her divorce.
"I always say I wanted to have a big family, because I'm from one, so I'd like four or five children, but I don't know realistically if that's going to happen. You go through something like a divorce and nothing else matters in the world except that," she said.