"I hate being single," she confesses in our four page interview.
"I'm a happy home bird. I love the comfort and love involved in a marriage.
"And if I'm ever single in the future.....there's always Tinder," she laughs.
Not only that but his lover was her best friend of 20 years Jane Pountney - who'd been a bridesmaid at their wedding.
"It destroyed me," she admits.
"I just didn't see it coming at all."
She's written about this turbulent time in the book and admits: "I knew I needed to get those chapters done quickly and I didn't read it back. I still can't.
"The rest of the book is fine but I still can't read that chapter."
Read the full interview ---- including Katie's views on a reunion between her and Pete; what she really thinks of Emily ---- in the new issue of Reveal, out now. Just 99p!