Personally I won't let anyone know their SO are cheating on them because, 1. It's not my business. 2. I don't know what's going in their
While this isn't a definite sure sign your partner is having an affair with a co- worker, it's important you consider their current role, and past work
My husband doesn't know about the several-year affair I had with my coworker. Things are so good now, I'll probably never tell him.