Christine meets with Carter and explains the route that she and David took to the Hamptons. She says that David behaved normally. After dinner in Sag Harbor, they found the napkin notes on their car, and David told her that the notes were probably left as a prank. Even so, Christine couldn’t get the note’s message out of her head, so she tried to check David’s phone for evidence that he was cheating on her. She gained access by holding his phone up to his face when he falls asleep on the beach. There were no dating apps, but on Instagram, she saw that he exchanges a lot of flirty messages. She woke him up and confronted him about this, and he called her crazy and paranoid, gaslighting her. Then he admitted that ever since his college girlfriend, Marnie, died, he has been addicted to attention from women. He complained that someone had recently catfished him. Christine got angry and threw a figurine at him, then headed to the train station.

Now, Carter shows David’s phone records to Christine. The records indicate that he made a phone call to a Rhode Island number after she was asleep.