Not only is he hiding secret feelings for another woman from on-screen wife Gabrielle Bartlett, but he's also been getting cosy with Troy Delmege's wife Ashley Irvin.
Yep, as viewers watch him grow closer to his wife Gab, it seems he still has feelings for a former flame.
During a heartfelt interview with NW, Nass, 50, opened up about the other love of his life – his partner who was forced to move back home to Japan to take care of her elderly parents.
"It's sad, but I couldn't ask her to stay. Her parents are old and she's an only child. Maybe other guys would have begged her to stay, but I just couldn't," Nass admitted."But I also couldn't pick up everything and go with her. I let her go and be with her parents and said if it happens and we meet again, then definitely."
After confirming they're still in contact to this very day, when pushed if he stills loves her, Nass hesitated, explaining, "I care for her", before admitting "she's the one that got away".
Er, and it isn't just his former Japanese lover who Gab needs to watch out for!
Once the cameras stop rolling, ladies' man Nass has been having a ball with groom Troy's "blonde barbie" Ash, 28!
"They couldn't keep their hands off each other," a snitch told NW after spying them in Sydney nightclub last week.
"It definitely looked like they were more than friends – it was very flirty. She even introduced him to her family who flew into town to meet him."
We did not see this coming!