Let's define EX - If you dated them and did not engage in the horizontal mambo or if you dated them and there were no intimate conversations between the two of you revealing the most private moments of your life; does this make them an EX? I mean what have you actually shared that is any different from what you might share with a BFF? Okay, granted you called each other girlfriend and boyfriend- you went on a few dates; maybe you sneaked a kiss but you called it quits!
So, what then? It's simple no matter how minimal the relationship was, if you called it quits it's done. Close that chapter in your life and move on!