First, remind yourself that confidence is everything, especially when it comes to smoothing things over after an awkward date. The situation is done and over with, meaning there's no reason to dwell on it. Try to move on with your life with a positive attitude.
When confronted by the coworker, maintain maturity. There's nothing worse than showing your embarrassment through unnecessary insults or a petty argument. You don't have to be friends with the person, but you don't have to make an enemy out of situation, either.
For further guidance, consider speaking with a gifted psychic. Oftentimes, psychics can use their talents to help you predict any issues that you may run into with friends, family and those pesky ex-boyfriends.