After seven months of dating, reality star Kristin Cavallari explains she and her boyfriend are breaking up this fall. A cast member of multiple shows spanning decades including Laguna Beach, Very Cavallari, The Hills, and The Hills: New Beginnings, Kristin tells her fans her latest news through tears this October. Kristin’s most recent relationship was the talk of the town for almost its whole duration due to her boyfriend, Mark Estes, being younger than her. The couple’s age gap was a hot topic and now she explains how it had a lot to do with why they’ve now gone their separate ways. The Hil…