idk if i have anything to contribute to this thread as there have been some great thoughts already posted, however i'm going to throw my two cents in anyway...
As a WS (I am both WS first then BS)....during the time of my As, i had all kinds of "whys" in my head...justifications for my actions..some were why i felt i was entitled to do it...he did this to me, he goes out and doesnt come home, he drinks too much, he doesnt help at home, etc. some were more along the lines of i just didnt think about him..i was always very clear to AP i didnt want to leave my M, didnt want to be resuced and ride off into the sunset...no expectation i would get caught, so my BH would never know, nobody would get hurt, so im having fun, nobodys getting hurt, why not? again i can go on for a long time about issues in my marriage with him with me etc and why i felt justified or at least excused in my behaviors...it hasnt been until i sat down and did the work that i discovered the reason...i was selfish and i wanted to. That is the why, there is no other why. I acted like a spoiled brat that wants what they want when they want it. I didnt think about my H or my kids or my family or my life or any of it, i thought about myself and what spidey wanted to do.
As a BS, i want to know why, why did you let me think we were working on fixing us, we were working it out, you still loved me, why did you let me think all those things when there was another woman in the picture? knowing how devastated and hurt you were when i did it, why did you do the same to me? you could have walked away the hero, everyone wouldve respected your decision to leave your cheating W, but you didnt, you stayed with me, why? so you could become involved with OW? Why not talk to me? why not leave me? why why why?????
I am only about 2 months out from his dday and why is still on my mind a lot. one of the only good things about us both being WS is part of me "gets it" and i have done the work, and what i mean is not in any way that he is justified...he isnt, but what i mean is that i can recognize that no matter how many answers and reasons and apologies my WH gives me, none of them are going to satisfy me. because he was drunk, because he was hurting, because the attention felt nice, while all of those things are probably 100% true...they arent the whys...the why for him is the same as it was for me, because he was being selfish. until he gets that, no reason that he could give me will satisfy me.
my WH has said something similar to an earlier suggestion..."I dont know why I did it, but Im not that person and I will never do it again and I will spend the rest of my life showing you that" ok yes thats nice to hear, its better than hearing him say well yeah i might do it again, but honestly it doesnt do a lot to "fix it" its words...im not that person? I never thought you were that person before, but you were. as was i. so yes i will spend the rest of my life showing my BS that i am not going to behave like that person ever again, but i cant say im not that person anymore..i am still that person. i am still the person who will be overwhelmed, i am still the person that will feel unwanted or unloved if my h behaves in the ways he has in the past, i am still that person that will be flattered that someone else is looking at me or likes me or whatever, i am still that person. What i can say though is that i will never behave like i did before, i will not cross boundaries, i will not lie, i will not sneak, i will not cause harm, i will not disrespect my husband, our marriage, our family. to me thats so much different than im not that person...yes i am.
i dont know if this helped anyone, pizzalover specifically, but it helped me to write it out so maybe thats why i did it...