05% not enough helping the wedding (RESENTMENT)
05% becoming a MIL (__% getting old, soon no new guys will want me)
05% ego kibbles, felt so good that a man besides husband feels "that way" about me
50% how "boring" my life was before, how "exciting" every day is now with the affair; I haven't felt so great like that since I was a teenager; the joy of waking up every day, the "anticipation" of "what will happen today" with my new lover.
05% new sex partner - variety is the spice
05% new sex acts - always wondered
05% I worked hard, I deserve it (corollary - everyone else is doing it, why shouldn't I?)
20% I'll be careful, husband will never know (corollary - what he doesn't know won't hurt him)
00% of cognitive dissonance (it's true, so what? it's not about why the cheating)
00% of Pavlov pellets (conditioned response? maybe, probably not; if so, it's not about why the cheating)
00% FOO issues. (It is true for some cheaters, but I doubt for hers. How bad a childhood, how dysfunctional? How many of us had ZERO dysfunction in our families? Would we even know how "normal" it would be? Doubtful I think that deep FOO issues went undetected for 20-plus years, then she suddenly went off the rails)
The process
Feeling "getting older" is in the background, it has been creeping along silently, I am not as "young and pretty" as I was at one time, but I'm still pretty attractive, but how much longer ... some other women I know turned quite quickly into "granny" looking, I hope that won't be me ...
Some event occurs with RESENTMENT - put it's toehold in.
How flattery that another guy likes me, that makes me feel good, it reassures my doubts about "getting older." It's hard to turn that away and put up a boundary when it feels so good. ("I know I shouldn't eat another slice of that chocolate cake, but it tastes sooooo good. Yummy!")
There is no "affair" yet, but my muscles sing every morning when I wake up; such an expectation of anticipation, what the day will bring, those days I will meet him, I look forward to it, I no longer feel my life as boring, routine. I haven't felt this joy waking every morning like this since I was a teenager.
Such guilt after I had sex. SCRUBBING, SCRUBBING. I feel like a fraud. Husband doesn't even notice it. Every passing day, it is easier to keep those ideas out, not let them in my head, ignore. As long as husband doesn't notice, this is OK. It is something nice "for me," but does not really "hurt" my husband. As long as he doesn't know. Must cover tracks not to let him know.
New sex partner, it's a little boost, but not the reason I'm doing this. New sex acts, not something I ever cared for that much, but I had been slightly curious.
As this goes on, "bonding" occurs. Keeping secrets together, we are "on the inside," husband is "on the outside," we are in "the club," he is not invited; we could have "inside jokes," husband would go right over his head. Allegiance is beginning to turn to new guy, away from husband. If it lasts long enough, it will happen, complete allegiance will switch to new guy I love deeply from old guy who I used to be with and feel nothing anymore.