I don't often talk about it and I hate recalling it, but about 15 years ago I was engaged to be married to someone I had been dating for a good 6 or so years. Her hobby was amateur competitive dancing, and she had a big show that she was training for with her partner. As the event got closer, she began coming home later and later, her mood began changing, etc. One night she didn't come home, so I confronted her, we fought, and I moved out.
After things settled down, I did talk to her a few times. In the course of those talks, she made the claim that she had "no choice" when she cheated. (I think that's why the other thread was of such interest to me - it hits close to home.)
I remember talking to people, admitting the state of our relationship wasn't great, but no one forced her to cheat. I was grateful when people would agree with me, because I was still desperately trying to cope with what happened and I couldn't handle much more than that. Much like the original "forced" thread, I would spew venom at anyone that tried to ask me to look deeper, get past the words, and consider her message to me, because if I could keep my focus on her nonsensical "no choice" wording, I could keep sane and keep myself believing that I am not the one responsible for the actual cheating.
Then, one day years later I woke up and something clicked inside. Maybe she wasn't trying to say she had no choice, maybe she was trying to say that she felt like she had no choice. It was my a-ha moment.
With enough time and space between us, I was able to ask the follow up question: She obviously had a choice, why did she feel like she had no choice? Was she really just "saying anything" to "blame-shift"? Or was I partially responsible for this mess in some indirect way?
I thought back to the things she had said to me. Some things were complete crap - all the dancers did it, she couldn't stop him, blah blah blah. However, some things did have merit... she had asked me for years to take an interest in her dancing, she had wanted to not stay home so much, she asked over and over again for more excitement and activity, etc. Nothing groundbreaking but I made many mistakes that people make in their 20s. Looking back, I could see how they would hurt and frustrate her when I did not respond. I knew she wasn't lying about some of those things, she had said them for years.
I started to realize that for every second I focused on the "I had no choice" statement, which was so much of a lightning rod to me for so many years, I was holding myself back. When the cheating occurred, there was the state of the relationship and there was the cheating... but every day after that, the cheating was now PART of the state of the relationship, and to dwell on her words is to be stuck in the past and reliving the cheating over and over again - exactly something I was trying to get away from. I never lost the ability to extrapolate that I am not to blame for her cheating, but I was now able to realize that just because cheating was "crossing the line" for me, I had crossed her line a long time ago in a different way. Suddenly, her talk with me went from being a silly "no choice" BS excuse to some extremely valuable information that, up until this point, I had not heard or considered. I am a better person for being willing to listen.
Anyway, I don't have a big need to hyper-focus on the fact that her cheating was her choice - it's obvious. If people ask, I usually tell them that I was engaged once, but I didn't pay enough attention to her and she cheated, so it was best to go our separate ways.
I also came to realize that I didn't need a literal refutation of the "no choice" phrase, nor did I need outside validation for my blameless state with regard to the cheating. I could finally give that to myself. It just took a long time.
Anyway, that's what worked for me. Perhaps my way of coping is not for everyone, but maybe hearing my story can help someone else as well.