Kristin Cavallari was once close friends with Scott Disick’s ex, Kourtney Kardashian. Disick and Kardashian dated on and off for nine years and had three children before Kardashian ultimately called it quits for a final time amid Disick’s ongoing substance abuse and infidelity.

Scott doesn’t understand why Kristin felt the need to read something he felt was a personal message between them out to the entire world,” a source told Page Six.