Elise confronts Lauren after finding her with Nathan at the hospital, immediately fearing that something romantic had happened between them. Lauren explains that Nathan has a genetic heart rhythm disorder inherited from his father. He was diagnosed after collapsing at work and had secretly undergone testing and treatment without telling Elise. Nathan admits he chose Lauren as his emergency contact because she was involved in his redevelopment project and also worked as a cardiac genetic counselor.

Elise realizes that Nathan had not been unfaithful, but she is deeply hurt that he kept such an important part of his life from her. Nathan explains that he was afraid Elise, being a nurse, would constantly monitor him and worry about every symptom. He wanted to protect their marriage from becoming centered entirely around his illness, but his decision only made Elise feel more excluded.

Lauren reassures Elise that there was never a romantic relationship. She had simply helped Nathan understand his diagnosis and treatment. Nathan had planned to tell Elise everything once he knew whether his condition could be controlled. When the doctor returns, the results show that Nathan’s heart rhythm has stabilized, although he must stay overnight for monitoring and further tests.

Elise decides to remain beside him and tells Nathan that hiding his condition was a serious mistake. She makes it clear that he cannot decide what she is capable of handling. Before leaving, Lauren jokingly gives the responsibility of caring for Nathan back to his wife. Elise then asks Nathan to tell her everything, from his first symptoms and diagnosis to his appointments and medications.

By midnight, Elise understands that Nathan had been frightened rather than unfaithful. She forgives him but makes clear that secrecy was still painful. She tells him they will change his emergency contact to her. With the mystery surrounding Lauren finally gone, Elise and Nathan agree to face his uncertain future together, this time without secrets.