<human>: Back Story:  Four months ago I learned that my wife of 4 years was cheating on me.  This was not a onetime "accidental" thing.  According to the information I can gather, it was going on for a minimum of 6 months, with regular weekly meetings.  In an attempt to understand, and to reconcile, I agreed to couple's counseling.  She promised that all communication with the man would stop, that I would never have anything to worry about again, and that she was going to be completely upfront and honest with me.  Counseling was going well.  We had our ups and downs, but the overarching trend was positive, hopeful.

Fast forward to the day before Valentine's Day.  I happen to wake up at 1:30am to find her sending an email to the same guy she was having the affair with.  They were planning a rendezvous for that day while I was at work.  I flipped the FUCK out, packed some bags and walked out.  

To further complicate the situation, the man she was fucking is a coworker of mine (someone I once called friend) and someone I have to see at least two or three times a week.  And here is where the "Subtle Revenge" comes in.  I absolutely must save face at work so I can't react the way I want to.  I am hoping to live vicariously through my fellow reddit trolls.  Revenge is a dish best served cold ... and in small agonizing bites.  What are some of the ways you have subtly fucked with someone without drawing attention to yourself?

Can you give me the gist of the text in a nutshell?
<bot>: Wife of 4 years had a 6 month affair with a coworker (former friend) of mine.  I still have to work with him and need to live through your stories of subtle revenge.