The late arrivals' latest argument comes as Billy, 28, lashed out at Susie, 25, after photos emerged of the single mother sharing a passionate kiss with disgraced NRL star Todd Carney.
The pictures - taken the day after Valentine's Day - left Billy shocked and humiliated, with the soft spoken reality star admitting it was difficult for him to take.
Speaking to the Daily Telegraph, he said: "What can I say? That's a really hard one for me - I have mixed feelings about that."
Blasting his bride's betrayal, he added: "You can really see Susie's judge of character by the people she hangs out with."
Billy also lamented his chivalrous treatment of Susie on the social experiment.
"I treated her with respect. I look at the TV and go, 'why were you such a gentleman to her?'"
Bad boy rugby player Carney's career was left in tatters back in 2014 when a photo was posted to social media showing the sports star urinating in his own mouth.
In the midst of the controversy Carney was sacked by his Cronulla team, the third club to fire him after Canberra and the Sydney Roosters.
The controversial athlete was previously charged with drink driving and had his license suspended for five years, as well as racking up a litany of offences including vandalism, disorderly conduct and setting a man on fire.
Susie has come under fire for "foul" acts of her own, and swiftly earned herself the dubious title of MAFS' villain after she savagely attacked Billy for "not having enough balls" and being "too small" on the hit series.