If not, you need not ever say anything. Don’t think about your ex and don’t talk about your ex. Don’t speak with your ex ever again. You need to let him go to the dusty history book shelves. Remember, that was a different you. Like Elvis, she’s left the building.

If you have a legal relationship with your ex. Tell a person on your second date. If you have have a third date, it likely doesn’t matter to the person.