However, in a candid interview with Elle magazine, the 31-year-old beauty has now admitted that Simon, 54, was in fact right to sack her.
She explained: “I can talk about this because I’m okay about it now.
“But I went through hell and it literally drove me mad. I became so desensitised, you could say terrible things to me and I wouldn’t even think about it.
“I’d read awful stuff about myself and not blink. I shut down because I didn’t know what else to do. Now, I can say that Simon was right to get rid of me. I wasn’t well in the head when that was going on, so it wasn’t going to work. But he wasn’t right not to tell me to my face.”
Cheryl also went on to reveal the details of a rather sweary text she sent to Simon on finding out she wasn’t in a job anymore.
She told the magazine: “[It read] F**k you, F**k Fox, F**k the orange and purple outfit. F**k the big hair. F**k the UK X Factor. F**k you all. I hate you.”
Well no one can accuse her of not being to the point.
Despite their rocky past, Cheryl is of course now back on good terms with Simon, rejoining the X Factor UK panel this year.
Cheryl goes on to say that she is only now ready to be back in the limelight after ‘losing herself’.
She recalled: “It only hit me at the beginning of 2013 that I’d completely lost myself. I’d look in a mirror and think: ‘Who the hell is she?’
“I didn’t know what I thought or felt about anything, couldn’t make decisions – I didn’t even know what to eat or drink.
“Something was seriously wrong: it felt like a nervous breakdown. I had to stop, get out of my life I’d been living and find myself again. The consequences if I didn’t were just too frightening.”
[Cheryl Cole celebrates birthday on private jet with Simon Cowell]
[Cheryl Cole recieves 310 roses for her 31st birthday]
Cheryl also went on to admit that she never saw the breakdown of her personal life (namely her marriage to Ashley Cole) coming.
“I thought I had every box ticked, career and personal. I was the first to get married. I was the one everyone thought would be the first to have a baby. And then the rug got pulled out from under me. I’ve learned that there is no such thing as a plan,” she explained.
“You can’t make them. I’m just enjoying finding out who I am. That’s good enough right now… I know I’m really lucky because none of what I’ve been through broke me.
“It actually taught me everything I’m going to need for the rest of my life. I love feeling that I’m strong because I have good women at my side. And I don’t give a f**k what people think any more.”
The full interview appears in the August issue of ELLE UK, on sale July 3. Also available as a digital edition.