Shankar VedantamHost, Hidden Brain · Journalist, Writer, Science Correspondent

The Half Truth That Ruined a Marriage

23 Jul 2026 · 1 min

Watch on YouTube

1:10

In this Hidden Brain excerpt, host Shankar Vedantam tells the story of Jennifer, who, before marrying her fiancé Philip, called her mother Donna for reassurance. Donna shared that she once had similar doubts before marrying Jennifer's father, but omitted a crucial detail: her parents had maintained an open relationship for much of their marriage, a fact that helped their partnership thrive. Jennifer later discovers this secret after her own divorce and reflects that, had she known, she would not have married. The segment introduces Harvard psychologist Leslie John’s research on self‑concealment and self‑disclosure, showing that keeping secrets can harm physical and mental health and strain relationships. It also highlights how an honest, vulnerable conversation between Jennifer and Donna ultimately deepened their bond, suggesting that while vulnerability carries risk, it can yield significant relational benefits. The excerpt ends with a call to listen to the full Hidden Brain podcast.

Chapters

Before her wedding, a woman named Jennifer called her mother, Donna, with doubts about marrying her fiancé, Philip. Donna reassured her. She said she'd had the same doubts before marrying Jennifer's father and that their marriage had turned out beautifully. Jennifer married Philip. Years later, after a divorce, she found an email chain that revealed the full story. Her parents had maintained an open relationship for much of their marriage. It was, as Jennifer described it, a release valve that made their partnership work. Her mother hadn't lied, but she'd left out the part that mattered most. Had Had Jennifer known that one detail, she says, she never would have walked down the aisle. Psychologist Leslie John at Harvard studies self-concealment and self-disclosure. Her research finds that keeping secrets can be damaging to our physical and mental health, and also to our relationships with others. Years later, Jennifer and Donna did eventually talk about that fateful phone call. And that open and honest conversation? It didn't destroy their relationship. It deepened it. Coming clean and being vulnerable Is not a risk-free choice, but it may have more benefits than you might think. For more insights about the science of the mind, tune into Hidden Brain on Apple, Spotify, or hiddenbrain.org.