MAFS AU: Natalie and Collins quit the experiment for good after fiery showdown

Married at First Sight Australia bride Natalie Parham has sensationally quit the show, leaving her husband Collins Christian seemingly stunned that their time together is over.

While the couple initially became the first pairing to ever walk off the series during the first Dinner Party, they returned to give their relationship another go.

However, after Christian was called out by relationship expert John Aiken during a fiery confrontation over what he had done to romance his bride, Parham decided to leave him.

During the first commitment ceremony, Christian admitted he needed to offer Parham more romance, before taking a swipe at it being said her father's recent death had stopped her being present in the experiment.

"I'm sorry, but I don't agree with you," he clapped back at Aiken, saying: "You can't just put grief to the side. This is a huge, huge factor." 

"John, let me tell you something..." he said, before Aiken shut him down.

"I haven't finished talking," Aiken said in response. "Let me be clear. You've never been in a relationship before and you are talking to me as if you're an expert."

But Christian's attempts to reconcile with his wife proved to be the last straw, with Parham lashing out what she saw as him acting and his inability to connect with her.

"Every moment I see you I am happy because that's what I'm here for," Christian said. "That's why I put 'stay'." 

"This feels like an Oscar's performance," she said back to him, after writing 'leave'.

"I don’t feel I can build a romantic connection with you. I do not see a future. I can’t see us forming an emotional and romantic connection. It is time for me to go."

"I can't communicate with someone that talks to me like we're on the set of Neighbours or Home and Away."

"Oh Nat - we're on Married At First Sight and I feel like you've just done Mind Made Up At First Sight," Christian replied. 

But Parham insisted he was not genuine, saying he "drained" her.

"I don’t think he’s devastated that his time with me has ended. I think he’s devastated that his journey has to end because I have said we’re done. I think if he could stay on MAFS by himself he would," she said as she left the reality TV marriage permanently.

Full episodes of the current season of MAFS AU are streaming on ThreeNow and airing on Three at 7pm Sunday-Wednesday.