Claire was upset at Andy for moving money from one account to another without telling her. He said he thought he had told her, but she insisted that he hadn’t. Typically, they would get into a loop of “I’m right. I told you,” and “No, I’m right. You didn’t tell me.”
If they had discussed the transfer of money, they probably would have figured it out. Since the conversation never occurred, they got locked into whose fault it was. Andy astutely summarized the conclusion: “Resolve doesn’t necessarily mean you agree.”