Finding out you're getting two-timed is never pleasant, but the small silver lining is that you get to righteously kick that cheater
to the curb. Plus you have the satisfaction of knowing you no longer have someone so inconsiderate in your life.
It's funny how this conversation evolves too, from having ZERO idea of who the guy is to "Oh, you mean my co-worker?" No, I'm sure he was talking about some OTHER guy with that exact, very specific name.