The Girls Aloud star had been told that the Chelsea full back was on the brink after their tearful split that the club offered to send him to counselling.
"If I thought I was cracking up, people were telling me that Ashley was in an even worse state," she wrote in her book 'Cheryl: My Story', which is being serialised by the Daily Star.
"'Cheryl, it's terrifying,' one friend said, and what she described made it sound like Ashley was going through a mental breakdown.
"'He's literally talking nonsense, he's got a beard and he's smoking and drinking loads.'
"Somebody else told me that Ashley had said something like: 'I don't want to be here any more.'
"I didn't believe he was seriously suicidal, but I was relieved to also hear that the club was trying to get him some help."