From other posters' reactions, it sounds like there has been more than one other thread in the past but my issue was whether the other active thread at that point, chronicling an identical situation, was yours. You indicated in reply that it was not. That's all.
I agree you're confused, but I think some of your own actions are responsible for that.
Now that you've said that the other thread was yours and that you'd name changed because it skews responses, you might want to think a bit more about that and how you deal with information.
I agree the mention of DV skews responses because people apply their own value judgements to it. I accept that the most important judgement about that is yours, but if yours is to decide that the DV was in exceptional circumstances and that it has no true bearing on your husband's character, have a think why you changed your mind and mentioned it, quite late into the thread?
Was it to alter people's responses because until that point, posters had been quite challenging of your behaviour?
Or was it to give posters a full picture so that they could give you balanced advice?
Only you know your true motives, but I see potential parallels here with what might be going on with your marriage and the affair.
Your husband doesn't have the full picture and so his responses are skewed based on the information he does have.
You don't have the full picture of the OM's marriage and so your responses are skewed based on the information he gives you.
The OM doesn't have the full picture of your marriage and so his responses are skewed too.
The OM's wife doesn't have the full picture......and so on.
We all have the capability to skew information we give and therefore control the responses. Sometimes the results are fairly innocent, but where the stakes are high, they are not. The situation you're in is one where the information various people are skewing and with-holding is compromising others' ability to make judgements and decisions.
And that sort of manipulative behaviour tends to leak out into other areas and affect other interactions.