If you notice that your spouse’s coworkers have started to act strange around you  - you should be concerned. If they struggle to make eye contact or no longer try to engage in conversation, it may be because they know your significant other is cheating. This is also a sign that the person that they are cheating with most likely works with them. While a lot of people have a don’t ask – don’t tell policy, their conscience may make them feel guilty when they have to face you!