How should I act when I see the guy that rejected me?

Anonymous
We dated for a short while and he ended up picking a different girl who he is now currently dating. I have to see him next week at a friends bday and I'm not sure how to act. Do I act like everything is fine (eventhough I'm really hurt) or do I ignore him and dont even say hi or do I say something about how he lied to me and how I'm mad and disappointed since we were friends first?
How should I act when I see the guy that rejected me?
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