June 2, 2015 7:21 AM EDT

Though Caitlyn Jenner’s new name and image were revealed to the world on Monday, it still remains a mystery how much Kris Jenner really knew about her ex’s – formerly known as Bruce – path to transition in the weeks, months and even years leading up to Caitlyn’s debut.

In an interview with Vanity Fair, Kris maintains that their relationship ended abruptly when her former husband “just decided, ‘I’m done.’ ”

Knowing what she knows now, Kris tells the magazine the way Caitlyn approached their separation and subsequent divorce felt like “the most passive-aggressive thing I think I’ve ever experienced.”

She asks rhetorically, “Why would you want to be married and have kids if this is what you wanted since you were a little boy? Why would you not explain this all to me?”

However, Kris, 59, does concede she wasn’t completely in the dark.

“When I met Bruce, he told me that he had done hormones back in the early ’80s,” she says. “This was a conversation that took place in the early ’90s. So, what he was telling me happened a decade earlier, and he never really explained it.”

For her part, Caitlyn, 65, contends that Kris was fully aware of the treatments and their side effects, including breast growth. Jenner says she was a “good solid B cup” when they met, while Kris brushes it off as nothing more than “a little bit of a man boob situation.”

In Kris’ mind, “there wasn’t a gender issue. Nobody mentioned a gender issue,” she tells the magazine.

According to Caitlyn, though, Kris witnessed her wearing women’s clothing while she was still living as Bruce; together, she says, they even established a rule that Bruce could only cross-dress when he was traveling alone and away from the family’s house.

Kris denies this entirely, saying her ex never cross-dressed in front of her, only that “somebody mentioned that at one point in his life he liked to dress up.”

This article originally appeared on People.com

Read next: Rob Kardashian Didn’t Recognize Caitlyn Jenner on the Cover of Vanity Fair

Listen to the most important stories of the day.

Contact us at editors@time.com.

Read More From TIME

Related Stories