At the time this happened I thought it was "sweet revenge," but looking back on it I'm now ashamed of myself for doing this. It was a mean-spirited and pointless action on my part that I now deeply regret. I should have just moved on... and while I'm sorry I did this, it's a very memorable event for the deviant character displayed by all parties involved.
I guess if you want to believe "what goes around, comes around" you'll probably think this was justified revenge. I've never told any friends about this even, because I would sort of like to purge myself of this. I recorded this as it's such a cinematic story and one of my most vivid sexual memories even though it happened almost 40 years ago.
I have never believed that confessing my "sins" to anyone was a valuable exercise. And, I always felt that "counseling" was a waste of time -- for me anyway. I am sure it helps others. However, I once agreed to attend couples' therapy under pressure from my then girlfriend.
She was my first long-term girlfriend, and the first woman whom I lived with. I was working and she was still in graduate school. As undergrads we had agreed to have an open relationship early in our romance. We both took advantage of this agreement and swapped partners with another couple and also each slept with several other people.
But after a year of this, my girlfriend said that she was not happy in the open relationship. She felt it was not working for her. She realized she wanted more love than sex and wanted to focus more on "us" without distractions and complications. She told me it made her uncomfortable, jealous, and very sad to think of me in bed with other women, touching them tenderly, arousing them and "loving" them.
She said the thought of me going down on other women made her especially uncomfortable. It was too intimate. She wanted me to reserve that intimacy for her. So, she asked if we could return to monogamy. I did love her and agreed to do so; and I did stop having sex with all other women entirely, just as I had promised.
Almost a year passed and although I was tempted many times, I continued to be faithful. Then by chance I discovered that she was secretly fucking her graduate advisor. I was working while she pursued her master's degree. I dropped into the graduate student offices one day after work as I was supposed to pick her up. I arrived early and discovered her office door was open, but she was not in. I decided to wait in the lobby and come back on time. As I walked down the hall, I heard a woman moaning in another office as I passed. I stopped to listen at the closed door like a pervert. I recognized her voice. I knew her orgasm sound well. There was a name plate on the door -- her graduate school advisor. I left silently. She would have to find another way home.
This devastated me. Not so much because of the sex, but because she had specifically asked me to return to monogamy and clearly did not do so herself. I felt like that request was worse than the cheating. I confronted her when she got home and told her I wanted to break up.