Dan Osborne is said to have called up Natalie Nunn and sent her "nasty messages" following an interview in which she confirmed previous reports that she, Dan and Chloe Ayling had a threesome last year.
Dan - who's married to Queen of the Jungle Jacqueline Jossa - denies the allegations that he and the two women romped in a London hotel room following a boozy night out.
Natalie also previously denied the allegations, first made by Chloe, but recently told The Sun : "It's true, I had sex with Dan. I was drunk and it was a huge mistake."
She goes on to say that he got in contact to beg her to deny it after Chloe's claims first surfaced.
Now an insider alleges, also to The Sun, that after Natalie's interview, Dan got back in contact to say she'd "ruined his day."
The source said: "Dan called Natalie and started sending her nasty messages saying she had ruined his day by speaking about the romp.
"Dan told Jacqueline he'd done nothing wrong, so to see this totally blindsided everyone around her."
Mirror Online has contacted representatives for Dan and Natalie for comment.
Dan and Jacqueline's marriage has been surrounded by speculation surrounding the cheating rumours.
He's also faced claims that he had a fling with Love Island's Gabby Allen - something both he and Gabby have denied.
After wife Jacqueline made it out of the jungle with her new crown, the former TOWIE star posted an emotional and very public apology for his "mistakes."
"So after weeks, months, years of constant articles & rumours, some true, some very untrue," he penned, "I want to publicly say, I know I have made mistakes, we all do as humans, but I've made some that have almost cost me my family.
"I have seriously learnt from these massively, So I want to publicly apologise to my beautiful wife and my family for the mistakes I've made.
"I am the luckiest man in the world to have what I have with Jacqueline and my 3 incredible children and I will spend the rest of my life being the best husband and dad that I can be."
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