How to react when you see your ex?

we are both on good terms but we don't speak. if we bump into each other we will chat and then go on with our business.

but she always comes to my hang out spots, i don't know if she knows that is where i hang out. she would keep walking past me, close enough to smell me. when she does do that i would chat with her and we will ask a few questions and move on being social with other people at the venue.

my problem is this. i asked her out on a date and she said no, but then she would keep around me or checking me out when i talk to other girls. she broke up with me a while ago but she knows i don't beg and i will not beg.
How to react when you see your ex?
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