As seen in a new promo for the show, the 23-year-old carpenter and self-proclaimed ladies man was caught repeating the rumours about Ali and her Bachelor In Paradise ex Grant Kemp.
"He made up stories that he knows people that are your friends that apparently emphasise the rumours were true," front-runner Charlie Newling tells Ali.
"Let me at him!" Ali says before confronting Nathan. "I heard you were saying really disgusting things about me!" says says in the promo.
"I've been so hurt in the past, because I've had people delivering lines to me. I've had people say, 'Yeah, I want two kids" and then when I go visit them in LA they're a party animal.'"
Speaking to WHO before The Bachelorette aired, Ali said she has "come to peace" with her ex and how it ended. "We all have one of those ex-boyfriends that just won’t go away, and he’s unfortunately one of those guys who is adamant and someone who wants those headlines and isn’t giving in."
Despite getting involved in mansion drama, Nathan is after the woman of his dreams.
"After my last relationship, I would like the next girl I am with to be my forever, so I’m taking my time."
The Bachelorette Australia airs Wednesday and Thursdays on Network 10 at 7:30pm