Situation #1: The wedding date
If you're single an ex is often the best choice. You can flirt without feeling obligated, you know how they are in groups of people, you’ll have a slow dance partner and someone to hold your shoes at the end of the night. But don’t get caught up in the romance and make a mistake.

Situation #2: The work party
Sometimes work functions turn into happy couples parading around in twos. If your colleagues are mostly married, it can be soothing to have a familiar face by your side. Keep it informal and introduce him by name, not by relationship label.

Situation #3: The random hook up
Running into an ex when you look your best is like finding the perfect pair of jeans: elusive and extremely satisfying. Sometimes, it can fire up sparks you thought were long gone.

Situation #4: The lingerer
If you still have feelings for an ex that show no signs of dissipating, it’s better to confess than to wonder what if. It’s difficult to make yourself vulnerable to rejection, but you’ll thank yourself when there’s one less thing to worry about.