He's rumoured to have shared a fling with series villain Hayley Vernon, 32, but Woman's Day hears rowdy groom Michael Goonan had another woman in waiting during filming!
"He would sneak out all the time – he was barely around when cameras stopped rolling," says one insider, who maintains the 29-year-old father-of-one told Stacey he was constantly bored by the show.
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"He met up with Rachel, a girl he knew from Adelaide," says a source, adding the two shared a boozy night together behind Stacey's back.
"Their night out ended up back at a hotel, and Stacey found out after it ended up on social media," the insider explains. "She was missing her kids and family and he was out getting drunk with another woman. It was an absolute slap in the face!"
On the night in question, a handful of MAFS grooms were returning from a booze-fuelled night at The Star Sydney casino when the father-of-one is said to have accidentally dropped a bag of white powder – which his fellow participants believed to be cocaine – on the floor of the CBD's Skye Suites.
"His face just turned red, he was paralysed… he didn't know where to look!" says the source. "He came back drunk from the casino and grabbed a handful of poker chips out of his pocket when the bag just came flying out – it was all very unfortunate," quips the on-set spy.
What's more, the offending groom was beside himself when he realised the ordeal had been seen by a member of the production team.
WATCH: Married At First Sight's Michael faces off against Steve in explosive dinner party fight. Story continues below...
"One of the producers witnessed the whole thing and she just lost it at him," says the insider.
"It was really heated – everyone was ordered back to their rooms and told to stay there. The production team tried to calm [Michael] down by assuring him that there were no cameras, but he was just so agitated by the entire situation."
The show's producers were furious about the mishap, especially given they warn the participants against socialising outside of filming to avoid missing out on any conversations.
"Production weren't having a bar of it," says the spy. "They told him in no uncertain terms they would remove him from the show if he didn't agree to undergo the sessions."