This comes from watching her famous sisters have their relationships play out for the public eye.
"A relationship is only meant to be between two people, and the second you make it the world's business is when it starts messing with the two people mentally," she said in an interview with Vogue Australia. "Like once everyone is let in, you're letting all these opinions into your relationships, and I don't think that's fair."
Given Kendall's preference for privacy, it makes sense that she and Devin quietly broke up over a month ago. This was reportedly due to their busy schedules with Kendall's modeling and Devin's basketball career.