If your former boyfriend takes the initiative to say hello to you, no matter what his purpose is, you can't seem too "mean". Remember: no matter you love or hate, don't show too much emotion on your face. Now you and he are just ordinary friends at best, or even "familiar strangers". You just need to be modest, show your bearing, greet them freely, and keep normal.
When I meet my ex boyfriend with my present boyfriend, I'll show my tolerance
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