Schwartz hatches a half-baked scheme to bring the gang back together, but Ariana sets firm boundaries with everyone regarding her ex-boyfriend's place in the group. Katie and Scheana make a promise to prioritize their friendship. A shocking admission shakes Lisa Vanderpump to the core. When Tom Sandoval dares to show up at See You Next Tuesday, he and Scheana square off about who's to blame for their current rift.