Jason Engler was left reeling on Monday's episode of Married At First Sight, after his 'wife', Alana Lister, disclosed a private conversation they'd had with the rest of the show's couples.

Confronting Alana, 30, back in their room at the couples retreat, Jason told his seemingly confused 'wife' that he was 'angry' at her.

'In front of the whole group, you threw me under the bus, which was uncalled for, come out-of-the-blue,' Jason, 35, told her. 

'My own wife, throwing me under the bus, I just feel like this is once again a situation where it proves that I can't trust you.'

Alana had told the show's other couples that Jason thought Bryce Ruthven's initial decision to 'leave' the experiment to protect his 'wife', Melissa Rawson, had been heroic.

Jason told Alana that he had told her that in confidence, and he felt betrayed by her decision to divulge it to the rest of the group.

'You don't have to agree with everything I say, but you don't have to throw me in front of the bus in front of everyone,' he continued.

Jason insisted that he was trying to 'stay out of the fight', after the other couples turned on Bryce, 31, and Alana had dragged him into the conversation.

'You think Bryce is a hero, but Bryce is in the wrong. I'm sorry, Bryce is in the wrong and I'm never going to have his back,' Alana told him. 

But Jason insisted their argument wasn't about Bryce, as Alana grew teary.

'Okay, this right here is why this will never work,' he told a stunned Alana, speaking about their own relationship.

He later added: 'I don't care that you're not on my side about Bryce, but it hurts that Alana's broken my trust. It won't work... I don't trust Alana.'