I can't help but believe she wanted him. There has to be something he had that she wanted
thats a logical conclusion and its one i made at first. my post may be a bit uncomfortable to read and will probably hurt BUT in the long run it will save you months of trying to puzzle it out. jjct (another poster on this site) told me something very similar when i was first finding out about my wife's affair(s).
you think ...
well, our marriage wasnt perfect (whos is) but it had some value. assuredly i valued it. i wouldnt just throw it away/kill it over "nothing" and without deeply considering what i was doing first. who throws away something of value without even a passing thought. i even have PROOF she thought about it because she was concealing it and the fact that one conceals it is proof that they did consider it, after all ... why hide something if it never even occured to you to consider getting caught and the consequences ... right? there MUST be something about this guy she liked or wanted or desired that i didnt have because otherwise why go to all this risk, why toss the marriage otherwise. right? why throw something away if you arent getting something "better" ... neh? all of thats perfectly logical thinking.
but thats faulty thinking. its trying to put some form of logic into a basically illogical thing. he didnt have anything you didnt. you think "if only my wife hadnt gone near this guy, given into him, hadnt been exposed to him ... or whatever ... that she wouldnt have had an affair. that gives him WAY more importance than he deserves.
she wanted and craved the excitement, being pursued, the lure of the forbidden, the secret life, the synergy one gets from being in a "new" relationship, being desired by someone new, having a form of power and control, etc.
none of that was possible with you because you have been her husband for awhile (an established relationship), there is no forbidden or secret life possible, nor the burst of dopamine from a new relationship or being desired by someone new, and an established marriage with norms, responsibilities, bills, kids, etc just can NOT provide what she wanted.
something inside of her is wrong, broken, or out of kilter. what doesnt matter right now. but its there, 100% and the proof is that she had an affair because that is NOT a healthy choice. so she had this broken, damaged part of her that made her ripe for an affair. that doesnt excuse her, but it just tells you what you already know ... shes broken inside and hid that from you (if she hadnt hid it ... well, then there wouldnt have been the possibility of an affair and you could have helped her or seen to it that she got help ... neh?).
so, not really looking for an affair but still ripe/vulnerable for/to an affair. it just took some guy ... not necessarily OM ... but just some guy to come along and pursue her, make her feel the things she wanted to feel ... and she would have given in and had an affair. if not to that guy then the next one.
so in some ways that is liberating. hey, there is nothing special about OM. all he did was give her ego kibbles and she gave him sex to get more. hes nothing special. in fact, all he has/had to offer were meaningless ego kibbles.
in some ways that is terrifying. if there was nothing special about OM then just keeping her away from OM doesnt really solve the problem. sooner or later this will be another guy coming along who will offer more ego kibbles to her. if she hasnt fixed what is broken inside of her then she will be what the waywards call "white knuckling" it ... imagine an alcoholic trying to quit drinking while hanging out in a bar all day - not the easiest way to quit drinking, neh?
the four really big questions are:
1: do you think your wife is willing to fix her shit.
2: do you think your wife is able to fix her shit.
3: what are you willing/going to do if your wife fixes her shit.
4: are you able to accept (acceptance is NOT forgiveness, its slightly different) that your wife made a series of disasterous decisions while a deeply damaged and broken person?
dont answer those questions now. think about them. watch your wife. see what she does. think about them. frankly you have between now and whenever to decide (a purely arbitrary time line because you can decide pre-divorce, post divorce, or whenever). if any of them are a "no" in your mind then the potential of R isnt there, if all of them are .. then the potential is there. what you decide is up to you. you make up your mind when you want. dont let anyone force you to commit to anything. think. watch. evaluate. judge. decide.
good luck bro!