Married at First Sight's Mike Gunner and Heidi Latcham have consistently struggled to make their 'marriage' work on the show.
And a new teaser for Monday night's episode shows that tensions will reach boiling point during a family visit.
Mike, 43, and Heidi, 38, host a dinner for their loved ones at their Sydney apartment and the night quickly takes an awkward turn when the frustrated 'groom' complains about married life.
'If this is marriage, I don't want it': MAFS' Mike Gunner (pictured) gave 'wife' Heidi Latcham a shock ultimatum in a preview for Monday night's episode
'If this is marriage, I don't want it. I'm out,' Mike tells a stunned Heidi at the dinner table.
The guests looked taken aback by the Gold Coast electrician's shock ultimatum.
It comes as the couple's co-star Cyrell Paule hinted the pair have split.
During an interview with Kyle and Jackie O on Monday, Cyrell said that only 'some' couples have a happy ending on the show - but remained tight-lipped when asked about Heidi and Mike.
Stunned: Heidi and the guests looked taken aback by the Gold Coast electrician's shock ultimatum
In her first media appearance since she was temporarily 'banned' from interviews last week, Cyrell said: 'I will let you know that not everyone had an ending like me and some actually make it to the end. And I said 'some'.
'Look, I'm actually good friends with them both [Heidi and Mike]... Umm... there's a lot that... ahhh... I can't say!' she stammered. 'What you see with them, that's how they really are... but...'
Radio host Jackie 'O' Henderson
