The 27-year-old singer, who is in a relationship with Joe Swash, admitted that she has "definitely thought about" cheating but would never personally act on it.
"I've been in relationships that haven't worked out and one in particular was for a long time and it didn't work, which I was devastated about," Stacey said on Loose Women.
"I've definitely, definitely thought about it," said Stacey on the topic of cheating
"I would be out and I'd get attention from somebody, even if it was just, 'how are you'. Just the thought of somebody touching me and I would think about that – not necessarily as a sexual thing – but just someone to stay with you for some time. I've definitely, definitely thought about it," she said.
Her fellow panellist Nadia Sawalha agreed, saying: "I think that's when people can be vulnerable isn't it? If you're not in a relationship where you feel cherished and valued."
The mum-of-two added: "I couldn't go through with it"
Stacey, who has two young sons, was clear and added: "I couldn't go through with it. If I wanted to be single and be with lots of different people I can do that and there's nothing wrong with it and no one can tell me otherwise."
Using the wrong word, she added: "But if I want to be monotonous and have a partner then that's what I'm going to do."
"[You mean] monogamous!" laughed Janet Street Porter. "But interesting you equated monogamy with monotony!"
The conversation stemmed from Loose Women's Frank and Fearless survey which launched on Tuesday. The survey is a nationwide report into the hearts and minds of women across the country. The Loose Women, who have also taken part in the anonymous survey themselves, will use the results, throughout autumn, as key conversation starters around prominent issues affecting women today.
Stacey, 27, has been dating Joe Swash, 34, since last year
Stacey has been dating former EastEnders actor Joe, 34, since late last year. The couple met in 2010 on I'm A Celebrity… Get Me Out Of Here! when Stacey appeared as a guest.
"It's going really, really well. I'm so happy," she told HELLO! Online over the summer. "Everyone says we're made for each other and it's been eight months of people saying, 'Why didn't we think of that?' and I'm like, 'I didn't even think of it, so why would you?'"
"We are like the same person, we come from really similar backgrounds and we've got so much in common. He's absolutely lovely, I'm so lucky."
The Shy singer has two children Zachary and Leighton from previous relationships, while Joe has a son Harry with his ex-fiancée Emma Sophocleous.