Cheryl Cole has revealed that she believes that she wasn't mentally strong enough during her last series on the X Factor.

She made the revelation, along with many others during an interview with InStyle magazine and said that she wasn't really focused on the last series of the show.

"The last X Factor series I did was too hard for me".

“I wasn't right in my mind enough to give it my everything and be focused. And I wasn't strong enough mentally."

She went on to reveal that Simon Cowell has been in touch with her over the possibility of her returning to The X Factor to help with flagging ratings.

"I've seen Simon since,” she said.

"Like, we're friends again. But, I don't talk about flagging things to him. He'd have a meltdown."

She also cleared up rumours that the Girls Aloud split is not final saying: “we've definitely split.

"I know Nadine always said that she never thought we should say out loud the words ‘we've split’, but at the same time we don't want to mislead the fans."