"I was pretty pissed off because I found out he slept with Stacey on the night of our one month anniversary on the show, Aleks [Markovic] told me," the finance analyst told The Daily Telegraph.
"He ditched me to have sex with another bride! At first, I was totally beside myself and so angry. But my philosophy is not to hold onto any negative energy."
While she was incredibly hurt by Mikey, it was Michael Goonan and wife Stacey who got under her skin the most.
"In a way, I felt that Stacey and Michael made such a mockery of the experiment because in the end you find out they stayed until the end despite knowing they both cheated on each other," she said.
While she was revved up for the drama on the episode last night, she is now incredibly glad that it is all over.
"I just want to put this nightmare behind me and use this platform to really help people."
Natasha's struggles were hardly shown on the experiment, with the star revealing to KIIS FM's The Kyle And Jackie O Show last month that she spiraled out of control after she left.
"I had to leave, we had to write leave," she admitted. "I had a breakdown and really needed to leave for my mental health.
She continued: "After parents' day, I had a panic attack in the toilet with my mum for like an hour and a half. Afterward, they filmed Mikey coming back saying 'let's try and do this' but I was already too tired.
"After that, I just shut down. Mikey and I got in a good space and then it was decided it wasn't good for me to be on the show. I lost it and started crying."
As for Stacey and Michael, the scandal eventually broke their relationship, despite Michael seeming to stand by his wife's side during the episode last night.
"I don’t know, I’m not going to speculate anything but imagine if that was true," he said. "Imagine a guy that’s literally getting been torn apart every single week for a kissing allegation, changing this whole life, running around and jumping over hoops for this girl, just image... I’ve changed everything, I’ve literally become a saint you know."
Mikey has admitted on several occasions that he and Stacey did sleep together, while Stacey has stuck to denying it altogether.