Have you had an Ex? I can tell you that is someone with whom a person was once associated, in a relationship, marriage
I have had an ex.  she was crazy!  Have you?
I have had ex friends, It depends on how you define it though because can refer to a variety of different relationships
True.  I was just thinking of an ex girlfriend.  I guess I have a lot of Ex's then.  Ex friends, ex girlfriends, ex employers, etc.
Well, let me tell you now that in social circles and noun is assumed to refer to a former person you have had sexual relations with
That was my initial impression.  I would think that is the most universal term regarding ex's whom people had sexual relations with, right?
spouse. This often has a derogatory tinge, especially if it refers to unrequited feelings.
my ex husband today, as cancer has taken another special person from my life. Even though our marriage did not work out, we became good friends. I will miss him and I will always love him."
In 2011, during the announcements of Murphy's return as a permanent judge for season 8 of "So You Think You Can Dance", it was revealed that she had undergone treatment for thyroid cancer. Although there was a possibility that she would never be able to speak again, she is now