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But no, it wasn't to her husband Michael Goonan, whom she allegedly cheat on, it was to Hayley Vernon, whom she'd continuously berated throughout the experiment after she kissed Michael during a drunken night out... all while standing by her hubby.
At the time, Stacey accused Hayley of taking advantage of Michael, who was a known party boy.
Then, Stacey allegedly called Hayley a sex-worker during a girls' night out, among other things.
'I do think I owe Hayley an apology anyway,' she said, while still maintaining that she believed Michael wouldn't cheat on her.
'Like, the way I treated her, whether she wants to accept it or not… she didn’t deserve me for going at her… I guess I was just being a loyal partner. I’m sorry, yep.'
The room was shook!
'I don't really know what the think,' Hayley admitted, shell-shocked, to which Stacey made surprising admission.
'That’s OK. It’s a big deal for me to apologise,' the law graduate said.