I found it very helpful when a long-time friend of both mine and my husband’s pointed out to me after our divorce that my ex was a narcissist. Suddenly all the pieces fell into place and it made sense of my entire 24 year marriage. While I agree that it can be a mistake to diagnose a spouse solely based only on their behavior during a midlife crisis, sometimes there were issues present long before. Understanding something like narcissism is important to making better dating choices in the future.