Fans of MAFS UK are convinced they spotted the moment one of the show's most seemingly solid couples started to show cracks in their relationship.
In the episode aired last night many fans were left fuming after Kieran displayed behaviour towards his wife Kristina that many believed was uncalled for.
And now it seems many fans believe the writing has been on the wall for the pair for some time.
Taking to Reddit fans discussed the 28-year-old former clown's recent behaviour towards Kristina.
One posed the question: "Do you want to be paired with the one who comes across unhinged from the outset, or the one who unravels slowly...?"
Another fan said: "It's all got a bit bleak really quickly."
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They said: "If you recall they had sex on their wedding night and after that he was done."
"All the subsequent excuses (the cold sore, the PMDD, the emotionally damaging ex’s, etc.) was all a cover for Mr Nice Guy."
"I think anyone would prefer Adam and Casper saying from day one their match wasn’t their type."
On a separate MAFS UK thread on Reddit, many said they were starting to question the mechanic's motives, with one commenting: "He clearly isn’t into her now, and I feel like he’s just trying to chip away at her so she ends it and he remains looking like the good guy."
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Others accused him of faking it: "Kieran has been so shady. I really feel for Kristina."
In last night's episode, Kieran is seen comparing Kristina to his ex, admitting to his wife: "I wrote down differences with you and my ex. It's scary how similar you actually are."
"You're outgoing and she wasn't, that's the only difference."
Kristina was visibly upset saying: "All he has done is relate me to his exes, I am not his ex."
"I've waited and waited for this boy, I'm at my wits end now. There is only so much I can do."
At the end of the show as tonight's episode was previewed the cast were also seen in tears as the relationship seemed to reach a new low.
Until recently, Kieran and his 31-year-old dog walker wife were deemed to be the strongest couple in the experiment.
Prior to taking part in the experiment she had said: "I’m funny, full of energy, positive, and I’m a vibe."
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However, she had issued a warning for her new husband, saying: "Something I do that my partner might not like is being too loud."
"I hope my new partner is ready for the ride of his life."