Louis Staples It was an earthquake that broke the pop-cultural Richter scale: the revelation that “Vanderpump Rules”stars Tom Sandoval and Raquel Leviss were having a secret seven-month affair behind the backs of their closest friends. But there was one of their co-stars who didn’t find the news of the affair quite so shocking: Lala Kent. Kent was the first cast member to suspect that Sandoval was cheating on Ariana Madix, his girlfriend of nine years. Madix found out herself when she discovered an explicit video on Sandoval’s phone, and, as Variety detailed in a May 17 interview with “Vanderpump Rules” executive producer Alex Baskin, by the time TMZ broke the story on March 3, Bravo’s cameras were already at the Valley Village home she and Sandoval share to capture the fallout. Those astonishing scenes aired during last week’s season finale.