How do you react when you see your ex?

I live in a small town and i was just thinking on how i would react if i ran into my ex. I dont know if we ended on bad or good terms because he broke up with me but we still communicated everyday after it. Things were still good between the both of us until i made it clear we no longer needed to stay in contact with each other since we are broken up. He blocked me but he really didn't need to.

But im just curious how would you react if you saw an ex?

Act like you don't know them
smile and say hey but thats it
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How do you react when you see your ex?
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