“How can someone seem loving for years—then suddenly turn cruel?”

This week’s Fan Mail revisits a letter that struck a nerve with listeners. A woman wrote about her daughter-in-law, who had seemed like a wonderful addition to the family for seven years—until she “suddenly turned into a monster.”

But after the episode aired, Dr. Kerry received another listener’s response who offered the opposite perspective: “I was in a 23-year marriage marked by coercive control and escalating abuse. My in-laws adored me—until I began calling out my husband’s behavior. Then they rallied around him and turned on me.”

In this episode, Dr. Kerry unpacks six possible explanations for why someone may seem to “suddenly change” in a relationship or family dynamic.

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More About Dr. Kerry

Kerry Kerr McAvoy, Ph.D, a retired psychologist and author, is an expert on cultivating healthy relationships and deconstructing narcissism. Her blogs have been featured in Mamami, YourTango, Scary Mommy, and The Good Men Project.

In Love You More, Dr. McAvoy gives an uncensored glimpse into her survival of narcissistic abuse, and her workbook, First Steps to Leaving a Narcissist, helps victims break free from the confusion common in abusive relationships. She hosts the Breaking Free from Narcissistic Abuse podcast and offers trauma-related advice on social media.

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Disclaimer: This podcast/video is for educational purposes only. It does not constitute therapy, counseling, or professional mental health advice. If you are in crisis, please call 911 or your local emergency number.