This isn't quite the same, but hopefully you find it relatable and helpful.
A few years ago my husband went to a highly recommended dental practice in our area. Things didn't go so well, and the dentist that worked on him majorly messed up. Long story short, after getting no resolution from the owner of the practice, a very prestigious dentist (not the same one who actually did the work), I threatened legal action.
Fast forward 1 year later at my son's Kindergarten round-up. At the check-in table I see the dentist's last name on the class list. I thought it was just a coincidence, but then I saw him walk in! His son ended up in my son's class for Kindergarten, and our paths have crossed so many times since then. Later on we ended up parked next to each other at the circus, in downtown Chicago -- really, of the hundreds of cars in the parking lot, how the heck did we end up together? Then when we went inside we were sitting 2 rows behind them during the circus! The next month my son went to their son's birthday party. This year they were on the same football team, and again in the same classroom. Guess who has become my husband's good buddy and has invited us over for dinner? The dentist that I threatened to sue!
So, the point of me saying this is to give you hope that you CAN get past awkwardness and act like adults. It is totally within your power to just put on a happy and welcoming face.