While speaking with WSJ Magazine, the actress insisted she didn't suddenly cut off all communication with Penn when the pair broke off their engagement last year.
"There is this need to sensationalize things," Theron said. "When you leave a relationship there has to be some f---ing crazy story or some crazy drama. And the f---ing ghosting thing, like literally I still don't even know what it is.
"It's just its own beast," she continued. "We were in a relationship and then it didn't work anymore. And we both decided to separate. That's it."
Theron and Penn were together two years before splitting last summer. Shortly after the breakup, the actress adopted her second child, August. However, Theron said Penn was never involved in the adoption process.
"And in my honesty about wanting to have more kids, there was an understanding that a relationship had to go somewhere before it was going to be — what you hope for, which ultimately did not happen," Theron said. "And so we had a very clear understanding. He knew that I was thinking about filing for another adoption but that we weren't filing together."
Theron also shut down rumors that Penn had been considering adopting her son, Jackson, whom she had adopted two years prior to starting her romantic relationship with the actor.
"It's not something that happens in 18 months. You can't do that to a child," she said. "So there was an understanding that I was a single mom with a very young boy who I had to put in a situation where he understood that Mommy dates but that he does not have a father, you know what I mean? You have to be very careful and very honest about that stuff. And Sean was great with all of that."