Hurt,
Going by what you say, I would say that your wife loves you, but she allowed herself to get drawn into a secondary relationship. Not in preference to you, and not because of anything you did or didn't do.
"I mean if she really loved me she never would have done this to me or our family right?"
One of the ridiculous things about affairs is that the people who have them fall can fall into a mindset where their two relationships can co-exist, separately. They don't see that a silly, minor side relationship has the capacity to wreck their important relationship. Then, when their important life partner finds out about the secondary relationship, and threatens to go, the person having the affair realises how stupid they have been to damage the big, important relationship in their life with a less important secondary one. That sounds like what has happened with you and your fiance. She loved, and loves you, but developed feelings for the guy at work and did not have good enough boundaries to manage those feelings in a way that protected her relationship with you. However, her relationship with the guy at work does not mean that she didn't love you. This is a poor way to put it, but a design fault in human emotions means that it is possible to love one person and develop feelings for another. That is where boundaries should kick in, and call a halt to the process. In this case they didn't, which indicates not an absence of love, but an absence of boundaries.
But what happened when she thought she might lose you? She panicked, she cried, she begged. She wasn't faking that. Her absence of boundaries came back and clobbered her big time. And they still are. You say that she hasn't suffered tangible consequences, but she now wakes up every day knowing that her relationship with you, her prospective husband and father of her children, is on thin ice and that she is 100% to blame for that. That knowledge is with her all day long, every day. And she will know how she has lowered herself in your estimation, and that she may never restore herself to her former status in your heart.
None of which will make you feel any better. All I can say, from my own experience, and what many others have written in this forum, is that healing definitely does take time. It sounds like you and your fiance are indeed doing all the right things as you say, which will definitely help the process.
Outing the OM to his wife? Well, that is an option. In the forum it is often recommended as way to derail an ongoing affair, but I do not think the affair in this case is still 'live'. There is a an argument for letting the guy's wife know that he's a cheating turd, so she knows and does not continue her relationship with him in ignorance.
There is an argument to do it purely for revenge because he intruded on your relationship. It's human nature to want to get back at people who have hurt us. However, you have to bear in mind that his wife might respond by contacting the human resources department and complaining that your wife seduced her husband, and how do they feel about a boss doing that with a subordinate? In which case, both of them might get fired simultaneously. That being the case, why not set a deadline of them no longer working together in two months' time, or you inform his wife, and let the chips fall where they may?
It is good that your fiance is also applying for other jobs, because it doubles the chance of their ceasing to work together as quickly as possible.
"I still struggle with the shame of wanting to R with a WS"
There is no shame to that. This forum is chock full of people who loved, and in some cases still love, people who cheated on them. You don't fall out of love with someone in an instant, no matter what they do. You haven't fallen out of love with your wife, but because of what happened, you resent loving her. It's a horrible feeling, and we've all been there. The important thing is not to get hung up on the notion of shame. Instead, listen to your heart:
"I badly want to R with my fiance and preserve my family"
So there's your answer. As long as your fiance is working flat out to rehabilitate herself as a reliable life partner, and the stupid affair is over, you should work towards reconciliation without any negative junk like 'shame' blocking the process. There is no shame in loving a person. And please do not get diverted down the blind alley of 'self-respect' and 'not putting up with any crap', etc. Loving a fallible person does not mean you have no self-respect, or that you are a soft touch who gets walked all over (isn't the male ego a wonderful thing? How we torment ourselves with this stuff...) Leave that stuff for Schwarzenegger movies, and instead, follow your feelings.
If you do not feel valued by your fiance, or what you want is some tangible signs of that, you should bring that up in MC. I know there's the age-old argument of "If I have to tell you to do something, then it isn't coming from you", but that ignores the fact that sometimes people just don't realise what their partner needs. To you, it might be obvious, but your fiance is not a mind reader. I have a feeling that as soon as she gets an inkling that you need her to prove she loves you and thinks you are special, she will do it. She has made an effort with everything else.
It could be that she doesn't think a man has those kinds of needs, and that what you need from her is the visible destruction of the affair and everything that went with it. She may be so focused on that that it isn't occurring to her to win you back and prove that she loves you. That might even be a sign that she doesn't realise how unloved you feel because she never stopped loving you in the first place. She just let a foolish, secondary, lesser relationship develop when she should have had better boundaries and nixed it before it went anywhere.
In fact, the absence of those boundaries and the need to build them high and strong could be a good theme to pursue in MC.
In closing, I think there is a lot of potential for your relationship to recover, but you do have to give yourself time to heal. There are plenty of people here who have walked the same road you find yourself on, and they will do everything they can to support you. Take it day by day, look after your needs, and use the MC to express whatever you need or are feeling. Make them work for you!
[This message edited by M1965 at 5:59 PM, April 26th (Wednesday)]