Sara, 33, revealed that her construction project manager Hayden, 45, threatened to end their marriage whilst filming the show.
"Hayden threatened to divorce me several times throughout the series," the former flight attendant told New Idea. "But I won’t give him the satisfaction. He’s not rich enough for me to take him for everything."
The mum-of-one admits that their differing opinion on Sara's renovation experience caused the bickering.
"Hayden is always telling me I know nothing about building and I think I do, so we fight about that," she explained.
"Hayden became my punching bag, I took things out on him," she said.
The pair previously opened up to WHO about their relationship, and how they fell in love.
"It wasn’t like, 'Oh, I’m madly in love with him.' It just grew, and when you fall in love with your best friend it’s a lot different to falling in love in an infatuation situation," Sara said.
The Block continues tonight on NINE