But the final nail in the coffin was when the personal trainer demanded a fee for appearing in her reality TV show.
Over the weekend Kris announced their split on Instagram as Katie moved on with her new toyboy Alex Adderson in Majorca.
But now The Sun Online can reveal it was actually Katie who ended things and not Kris, as his post suggested.
An insider told us: "She found out that he was telling his mates about their sex lives and that they'd had sex in the sea in Thailand. A couple of his mates high fived her and mentioned it when they were introduced to Katie.
“Katie was fuming, she couldn’t believe he had betrayed her like this after everything that Kieran had put her through. Anyway, she forgave him but it was very short lived.
“The final straw was when he asked for a cut for appearing in her reality TV show. She got worried he was just like all the other men who wanted to use her to make money."
In his post this weekend, Kris explained: “This wasn’t an easy decision for me to make, however Katie Price and I are no longer together.
“It’s just clear we both want different things…
“Who knows what the future will bring but I wish her all the best.”
Insiders said at the time that Kris was very upset about the break up and insisted it was actually him who bank rolled the relationship with the mum-of-five.
A source told The Sunday Mirror: “He bankrolled everything the whole time they were together and really cared about Katie.
“They tried to make it work but he just couldn’t carry on with the relationship.”
Katie, who is known for being very vocal about most things, has not yet commented on the split and has remained on holiday with Alex.
The Sun Online has contacted Katie for comment, while Kris declined to comment.
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