Kristin Cavallari has made it clear she will never forgive her father, Dennis Cavallari, after he allegedly “crossed the line” with her children.

“A lot has happened with my dad. He’s crossed boundaries with my kids, and those are dealbreakers for me,” the “Hills” star told Page Six Radio hosts Danny Murphy, Ian Mohr, and Evan Real on Thursday.

Kristin, who shares sons Camden, 12, and Jaxon, 11, along with daughter Saylor, 9, with ex-husband Jay Cutler, stressed the need for “accountability.”

“If I hurt your feelings and I come to you, just want me to say, ‘I’m sorry,’” Kristin explained.

“Not defend myself or explain why I did it. Just acknowledge and apologize. That’s very hard for many people.”

The 38-year-old reality star added, “When someone crosses a boundary and refuses to take responsibility, I can’t keep them in my life.”

“People around me don’t need to understand, and they shouldn’t judge,” she said. “If they knew the full story, they’d understand why I’ve cut him out of my life forever.”

Kristin, who shares her children with Jay Cutler, explained the final straw was an incident involving her kids where Dennis “couldn’t even apologize.”

“It felt like gaslighting,” she stated. “I don’t have time for that. Life is too short to keep someone in your life who only causes hurt and sadness.”

Earlier, Kristin called “cutting her dad out” of her life “the best decision I’ve ever made,” acknowledging it might seem harsh.

“A weight has been lifted. I don’t miss him at all,” she shared, noting that the estrangement from her father, who she calls a narcissist, was something she had been contemplating for years.