But the Bolton-born singer doesn't believe her relationship with Mathew had anything to do with her leaving the show.
Asked if she thought the story led to her departure she told Look magazine: 'I'm not sure if that was the case because I think I'd have gone out the week before, when it was a big story.
I just didn't feel great in my clothes so I wanted to lose a bit.
'I'm probably still massive compared to some singers out there, but I don't want to lose any more. She added: 'I bought a cross-trainer, because I hate running, and I try to do 50 minutes a day on it.
In an interview with The New York Times, Jeff Bridges called White's performance in Chuck and Buck "the performance of the decade".
I gained a lot of weight in the X Factor house because I wasn't exercising and was eating whatever I wanted.
He also had a role in the 2004 remake of The Stepford Wives, and the 2008 film Smother.
Chuck & Buck was named the best film of 2000 by Entertainment Weekly.
I also do three sessions a week on the Power Plate at the gym.
'I got really annoyed with the gym's personal trainers who were always banging on about only eating protein at night, only fish, only vegetables.