Most Helpful Guy
best i can tell you is not think about it. the truth is, you're never gonna be ready for it.
Most Helpful Girl
Best way to conduct yourself when you see an ex is to be pleasant, joyful, constantly show a million dollar smile, and appear to be well put together. Even if you are the complete opposite. NEVER let it show. Break-ups can be complicated and if you were the one who was dumped, you certainly don't want him thinking "Good thing we're not together anymore. She's a mess!"
It's also important for you to realize that you don't have to be able to get along with him. You don't have to even try to avoid an awkward, obligatory vibe. The reality is, you don't have to have anything to do with him. HE'S YOUR EX. You no longer owe him ANYTHING at all.
I have found that when it comes to being at an event with your ex, it's best to focus on the event, appreciate everything special and unique about the event, concentrate on your company/the people you showed up with, and really stay focused on having a good time and showing others a good time. Don't be focused on your ex. Don't have expectations. Act like they are not in the room and don't show them that they have any power or effect on you.