Married at First Sight Australia groom Jack Dunkley is under fire again from his ex-girlfriend Courtney Jade.
She has claimed in a bombshell social media post that 'red flag alpha male' Dunkley slept with her while the show was filming and he was married to Tori Adams.
In a widely circulated post from Jade's Instagram Stories, she claims Adams knew it had happened as well.
"When he says he's into his wife but he comes home and sleeps with me and proceeds to break my heart again," she wrote.
"I shouldn't have done it but I did not know the disrespect or outcome of this show.
"Lessons were learnt... Tori knows and doesn't care so enjoy my seconds."
The Brisbane-based ex previously said she "suffered" from Dunkley's comments about her on the show, including labelling her as "crazy".
In February, she used Instagram to hit back at Dunkley's comments and tried to prove the pair were together and happy when he pulled off an apparent disappearing act.
"I don't deserve to be portrayed the way I have been," she wrote.
"For something so meaningful to be disregarded like nothing. All I can do now is put my armour on and fight a battle I never wanted."
Concerns have been raised about various "red flags" about Dunkley on this year's season of the social experiment, right from his initial wedding and later when he told fellow groom Jono to "muzzle" his woman, Lauren Dunn.
Relationship experts said groom Jack Dunkley's "Muzzle your wife" comment at the dinner party was "one of the worst things" they have ever heard on the show.
"I was disgusted by it: put a muzzle on that woman. I've heard some things in this experiment that have repulsed me. That was one of the worst things I've heard," John Aiken said.
Full episodes of the current season of MAFS AU are streaming on ThreeNow and airing on Three at 7pm Sunday-Wednesday.
