So, a few years back I became involved with a married man. Not my proudest moment but I genuinely loved him and was broken-hearted when it ended. FWIW I was the one who finished it (when it became clear - for various reasons - he couldn't leave in the short term). I do regret causing pain to him and his family, so far as I know he and his wife are happy now, certainly they are still very much together.
I haven't met anyone since, and admit I do still think of him from time to time. I haven't made any attempt to contact him since it finished, nor vice versa.
Anyway, in a few weeks I have to attend an event. There's not really any way of me getting out of being there, it's something I have to go to. And I have now found out from a friend of a friend that he will also be there. Which has completely thrown me. I don't know whether he will try and speak to me, and if so whether I should engage in conversation, walk away or what. I obviously don't want or intend to make a scene, I'm simply worried it will be really awkward.