Moody's suspicions about Pearl and Trip lead him to their secret hideout. When he sees them together, he lashes out at Pearl and gets into a physical fight with Trip. When he returns home, Elena accuses him of getting Pearl pregnant after she sees Pearl's name on a document at the abortion clinic. But Moody — not realising at the time that Lexie got the abortion — reveals to his mother that Pearl has actually been seeing Trip.
He later broods about Pearl while watching a news segment showing the McCulloughs' victory in court. After griping to Izzy about how "rich people, beautiful people, popular people" always get what they want and think they own everything, Izzy gives him a reality check, saying that he's no different for believing that he's entitled to Pearl's affection. Ouch.
The next time we see Moody, he's in the room during Elena and Izzy's last showdown and begs Izzy to stay before she leaves for good. He then assists Lexie and Trip in their act of arson to burn the remains of their fabricated lives.