Gavin Newsom has defended not detailing his relationship with model and college lacrosse star Brittanie Mountz in his new memoir. The California governor opens up about his colorful love-life in the memoir, released February 24 , including describing his affair with staffer Ruby Rippey-Tourk as the “the worst betrayal of my life.” The then-mayor of San Francisco was in the process of divorcing his wife Kimberly Guilfoyle in 2005 when he started the two-year affair with Rippey-Tourk, who was