A girl once told me that when she hears a guy say, "My ex is crazy" she runs for the hills because more then likely the guy did something to drive the girl "crazy".
Have you noticed that most guys tend to say this when you ask them about their ex-girlfriend? If you're a guy and you say this you might want to reconsider the situation and check yourself.
There is a psychological term called gaslighting where a person actually drives another person to believe they are crazy when in fact they are the ones with a disordered behavior.
If you're a girl and a guy says this to you maybe you'll have a better response now to the comment and can use the above signs to determine if the guy is a gaslighter.
Good article.keep it up