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Leonard keeps an affair secret from Sheldon, Howard and Raj.
Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.
Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
Sheldon begins a platonic relationship with Amy, Howard reconnects with Bernadette eventually asking her to marry him, Leonard begins to date Raj's sister Priya, Penny becomes friends with Amy and expresses regret at breaking up with Leonard.
