Melissa tells Bryce 'I'll go' after troubled relationship in MAFS promo

Melissa and Bryce have had one of the more controversial marriages on Married At First Sight this year, and it looks like things will come to a head in tonight's episode, if a new promo is anything to go by.

"From the very beginning she's been through hell," the voice-over says as we get flashbacks to Melissa and Bryce's relationship. This includes when Bryce told Melissa she was "not ugly" on their honeymoon, and when he ranked her fourth out of all the brides during the confronting Confessions Week task.

"Fourth? That's a kick in the guts," Melissa said at the time.

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And while the couple enjoyed some cosy moments during Intimacy Week by practising some of new expert Alessandra's tasks, there's no cuddling, kissing or eye gazing in the promo for tonight.

"Over the last few weeks it's been extremely challenging," Melissa says. "This, I'm literally shaking over."

Then she says to Bryce: "You shut me down, going, oh, that's how you feel. This is hard for me, too. I'll go."

Bryce appears to be in tears over the conversation. What could Bryce have done or said to make Melissa so upset?

Right at the end of the preview we see Coco slip into a sheer, bedazzled outfit.

"Coco goes in for the kill," the voice-over tells us.

So far, Alessandra's new and improved Intimacy Week has provided some sexy and downright awkward moments for the couples. We've seen Patrick and Belinda entangle their limbs during a stare-off, troubled couple Samantha and Cameron fake laugh their way to better times, and Booka and Brett engage in a little role play.

Married At First Sight airs Sundays at 7pm and Monday to Wednesday at 7.30pm on Nine and 9Now. Stream every episode of Married At First Sight for free on 9Now.