How do I act around my ex-situationship at family gatherings while healing?

Met him on a trip in July, and we instantly clicked. We started talking. he was the first to say he was “in love” with me, but I wasn't there yet. We mutually ended things after almost 2 months and were on good terms, but only for me to realise I might’ve actually loved him. So I told him but this man switched up in literally 2 DAYS. Now we’re not together, despite HIM wanting me first. + no contact nothing.

My question is: how do i deal or act around him at dinners or mutual family-friend gatherings? Because I want him to regret fumbling me so bad. even tho im also still healing from it all

How do I act around my ex-situationship at family gatherings while healing?
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