But this is even worse...
Let's say you run in to that person again, let's say at someplace you least expect like, ohhhhh - I dunno, in a group setting of sorts. And let's also say that someone is in front of the group giving instruction and perhaps you haven't heard a word that was said because you were so caught off guard by this said person from your past you sit there instead thinking, wondering, asking yourself, "What is he doing here?" And then, "I wonder if he'll recognize me..."
And then let's say perhaps you turn around for a brief moment and he catches your line of sight and you can tell by the look on his face that he recognizes you and you really just want it all to go away, because you are really not interested. So instead, let's say that perhaps you pull your best poker face and pretend you've never seen him before as to hopefully deter him from starting up a conversation.
Yeah.... let's say THAT happens... Talk about AWKWARD!