Do not respond to the crazy ex. If he reaches you someway, use all of your willpower not to reply. It might be hard because he could say some truly provoking things. Or, you could just be at your wits end. But any sort of response only encourages him to continue.
If this guy picked a fight with you on one of your first few dates—when you really didn’t owe him anything—and then, out of nowhere, bounced back and said, “Sorry about that. Let’s just pretend that didn’t happen” he’s going to be a crazy ex.
So you’ve just gone through a breakup and you want to be sure you keep your cool. Avoid that “Oh my god…I’m a crazy ex!” moment and don’t do these things.
It'll get better if you avoid these counterproductive behaviors.