Sadly, I feel uniquely qualified to respond to this thread. My WH confessed his LTA of 7 years to me this summer. I was completely blindsided. Unlike you, I had to go through a few days of fence-sitting where WH was "deciding" between the OW and myself. Also, he didn't begin by telling me the full extent of the A -- I had to dig until I realized that it was of 7 years duration. In a way, this was good, because I don't know how I would have reacted if he'd started with this -- too much to handle. In any case, by day 2 or 3, he'd committed to me and our marriage.
As healingtree says, your WW has been living with this a long time. However, she probably hasn't thought a lot about what would happen after she owned up -- for her, that was doubtless the big hurdle. She doesn't realize that's just the start of a very, very long road.
You say you're upset because she's going on as if nothing had happened. You need to tell her that. She's had a lot of practice blocking out things (one thing you'll hear a lot about on the I Can Relate (ICR) section that focuses LTAs is "compartmentalization". In order to be able to live with their As, WSs (wayward spouses) tend to be very good at putting things into boxes -- A doesn't relate to B, no matter how much logic or common sense says they do. It's very, very hard for us normal folk to get this, but it is a genuine phenomenon. Typically it's something people develop in childhood to block out stuff they can't deal with.)
This may sound like mumbo-jumbo right now, but unfortunately it's part of trying to understand what and how this could have happened.
Like your wife, my WH just wanted to move on. He confessed his "mistake", committed to me and the family -- done, right? Uh, no. First, he had to "get" that the damage to me is permanent and long-lasting. Second, he had to get that it was now his job to help me heal. Third, he had to get that you don't just have an A (especially one as long-lasting as this) and "move on". Uh-uh, no way. This means MAJOR changes, bro. This means you have to own your shit and figure out how you can be so majorly fucked up as to do something as horrible and deceitful as this. What kind of messed-up fool is he? This is a sign of deep, deep fuck-up-edness.
The other component is that she owes you, man. During that time she was with the OM (other man), she was neglecting you. Sure, maybe she wasn't nasty or unpleasant (my WH was unfailingly kind), but she was diverting sexual and emotional energy that SHOULD have gone to her husband and kids toward this other person. This will inevitably affect the quality of the relationship she and you have. She will deny this, I bet, but it's true. My WH got increasingly entitled over the years and, I think, hardened his heart to me a bit and got used to not really thinking about my needs. He certainly didn't put much energy into sex, and rationalized it that I just wasn't that interested. Well, of course I wasn't that interested, given that I was doing the work around the house etc, (and resentful about it) and he wasn't exactly displaying much interest, either.
There are a lot of resources on this site and a number of books that your wife really, really needs to read. The "How to Help Your Spouse Heal From an Affair" one is good. The various threads for WSs on here are excellent. (There's one about a drowning boat that is really good.)
But your wife needs to go for IC (individual counseling) to figure out how she could do such a fucked-up thing. And the two of you need to go to MC (marriage counseling) so that she can begin to understand the impact on you of all of this. I think my WH had been so used to sealing off responsibility for my feelings that it really helped to have another person validate my perspective. One of the best things a MC said to us (3 days post-DD! I work fast...) was that 99% of cheaters want to "move on" and 99% of betrayed spouses don't. You can't just "move on" and have a good post-A relationship.
I've written all of this assuming that you're interested in reconciling (Ring). The usual advice on here is that you shouldn't make any quick decisions, because your feelings are going to go up and down -- wildly up and down -- and you don't want to do anything irrevocable in that time. But one of the hardest things about R is the question of whether you can live with this. Well, the first question is whether your WW will do the work it takes to R. Will she be able to help you heal? Will she take responsiblity for the pain she's caused you or will she downplay or avoid it? That's her side of it. But given that she's willing to do the work (and that's a BIG given), can YOU live with this? That's where I am right now and I totally relate to your point about her getting off scott-free. My WH (I should say FWH -- f meaning former, because I am 99.9% sure this is over), is getting a better job (he switched jobs to be away from the OW), higher pay, and a skinnier (thanks, infidelity diet), sexier (thanks, hysterical bonding HB) wife. Our relationship will hopefully be better than before. Not too bad, from his perspective?
Well, except that he has been depressed, had suicidal thoughts, has had to leave a job he loves, and feels like a shitty person. He's had to endure hours and hours of therapy, and the knowledge that he's deeply deeply wounded me. He's had to put up with hours of my crying, knowing that it's all his fault. He's had to look at our kids and think about how close he came to wounding them.
But there's still the question of whether you can live with this. But only you can answer that. And right now, there's no way you can tell. But it's good for you to know that it's ultimately your decision, and your right to do anything you damn well please that saves your sanity. Because your WW has just blown your sanity to smithereens. Once my WH committed to R, he started to push for assurances that I'd stay. He wanted to get me a new wedding ring, do a vow renewal, etc. He now knows that he's going to have to wait a while until I feel safe enough to commit again. Initially, he scoffed at the 2-5 year timeline for healing cited on this site. But now he understands that this is realistic. I hope your WW is able to undergo similar growth.
I hope all of this helps. Those early days were truly horrible. Please do keep posting. I am so sorry you're here.
[This message edited by Blobette at 7:31 AM, January 14th (Monday)]