Friends/families of psychopaths, what made you realize they were a psychopath?

Many people who are close to psychopaths don’t realize they are until it’s too late. There are usually warning signs, such as a lack of empathy, selfishness, manipulation, and impulsivity, but these can be easy to overlook or rationalize if you’re not looking for them. In some cases, it may take a major life event – such as being betrayed or victimized by the psychopath – to finally see them for what they are.