Kristin Cavallari seems serious about wanting to remain friends with ex-boyfriend Mark Estes, because they recently hung out together ... at one of their old stomping grounds.
Mark Estes Jokingly Proposes Marriage to 'Love Island's Liv Walker, Video Shows | TMZ TV
TMZ
Mark Estes was out and about in Tennessee on Sunday night ... yet he wasn't with his ex Kristin Cavallari, but rather another..
