Most of us have been there: We unexpectedly run into an ex boyfriend or girlfriend in a public place -- be it the grocery store, gym, or dry cleaners. It can be hard figuring out what to do in such an awkward situation. Some people feel the urge to say "hi" and then go about their business, while others might feel compelled to ignore the person completely. I once ran into an ex girlfriend inside the library of a local college. I felt the need to be courteous, so I said "hello" and proceeded to sit at a table to catch up on my reading. I think most people in this situation would want to be polite, but they'd stop short of actually engaging the ex girlfriend or boyfriend in conversation. People might be afraid, and reasonably so, that chatting the person up might send the wrong signals, like a desire to be friends, or, worse -- to get back together! My recommendation is simple: Either greet the person, or pretend you didn't see your ex and just keep ...