Hi Something 
I was really interested in your post and noticed the different tone you used in this one, to your last. I'm really pleased you've felt able to empathise with his wife's position and how you felt about the continued deception.
A couple of things occurred while I was reading your post and they may or may not help.
You seem angry with him for pursuing you in the first place and you describe it as "chipping away" at you. It sounds as though he was quite persistent with you and that it was some time before you "caved in". I tend to take an interest in language and it sounds as though you regard yourself as very passive in this; almost without choices.
I think what tends to happen in these situations is that a person only perseveres if they can see a chink and that someone is persuadeable. I often point this out to women who berate the OW for her persistent pursuit of her partner. While I don't doubt the truth of that, it's evident that she didn't give up because she wasn't being given a firm enough deterrent and that any refusals were pretty wishy-washy and designed to make her try again.
And that the proof was in the pudding, if her partner did eventually "cave in". Many men and their betrayed partners in this situation like to put the blame on the OW for repeatedly putting temptation in his way, but I always point out that a firm "no" at the start would have in all probability stopped this in its tracks and if not, threats of harassment would be the death knell.
I understand that you were in a different position in that you didn't have the same considerations as the attached men in the above example and the same deterrents from starting an affair, but I wonder whether it might be more helpful to share the responsibility for not saying no more firmly when this first started, the occasions thereafter and finally, for caving in?
Secondly, this comes from my aforementioned friend's experience and I wondered whether it was applicable to your situation? She was also told by the MM that his wife had found out about the affair (twice, from memory) and on each occasion, his wife had asked him to end the relationship and try again in the marriage. These claims seemed consistent with his behaviour after each "discovery" in that he would for a while, give up physically seeing my friend apart from at work, but continued the relationship via E mails and texts.
This was torture for my friend, but she never felt able to step back and away and let him re-commit to his marriage. She used to say that she couldn't believe the wife was putting up with this and must surely be checking his phone to see if contact really had stopped with her. I remember being very sceptical about his claims and in fact once suggested that perhaps his wife didn't know at all and that it was him trying to cool things off, albeit in a half-hearted way. My friend couldn't countenance this at all, but of course she was never able to corroborate his stories about his wife's "discoveries".
Since the relationship ended (my friend's choice) a few interesting twists in the tale came out via the work grapevine and in the end (perhaps unwisely) my friend confronted him, before she finally left their joint workplace.
It turned out that it was just as I suspected. His wife never had found out and these "cool" periods were his attempts at extricating himself from the affair, but he didn't want to burn his boats completely. Therefore, his wife wasn't making any active choices at all, she had all the time been unaware, as far as he knew. Furthermore, he was honest enough to tell my friend that his marriage hadn't been as bad as he had been making out, but that he had started the affair (my friend had pursued him) because he thought it would be a pretty risk-free enterprise and fun for a while. However, he hadn't expected to develop strong feelings for my friend, but he had. However, at the core of it, they weren't as strong as they were for his wife.
My friend is still angry about this, but in truth some of this is with herself, because she believed a load of uncorroborated stuff throughout the affair and especially about his true feelings for his wife and her "knowledge" about the affair.
Mightn't be the same for you at all - perhaps you did corroborate that his wife knew, in which case yes, she did have choices if he really said that he was torn between the two of you, but even then I wonder did he tell her that it was over between you and that he had severed contact with you and was re-committing to his marriage?
Thanks for your insights. They are brave and interesting. 