SadPadre,
First like everyone here, I am sorry we had to meet in this way. You are going to hear a lot of things from various posters, and I suggest you read them all, take the advice that applies to your situation, and bank the rest. I say bank the rest as you may find like me (and many others on here) that in the beginning it all seems like too much, too fast - people don't know your situation, your WS - and you are right, we don't. While many situations are similar, there are always differences.
My WH cheated with a married co-worker (MCOW - which always makes me laugh as I think of it as Mad Cow - but I digress...). His only social network outside of one very good friend who lives far away has been his workplace. Before the A he was very involved in socializing in that group - not anymore as he was outed and is pretty much an outcast now - so he has a lot of alone time like your wife. He also suffers from severe depression, disassociation, and anxiety. Admittedly I never knew how debilitating those things can be until I lived with someone who suffered from them. He also comes from an upbringing like your WS - not much "caring" in the way I think of caring, a lot of physical discipline, and very little real engagement on anything but a superficial level. His whole family is a mystery to me - they seem almost robotic in their daily lives - and they are very disengaged. Depression is NOT an excuse for cheating, but it can be some of the cause of the mental state that allows someone to get there.
I'm going to make a very general statement here, but poor mental health seems to relate to just about everything. I think we are splitting hairs when we use the words reason or excuse for cheating - it is a character issue - and character and mental health are co-dependent.
To make a comparison mental health is not an excuse for doing drugs or being a drug addict - but there are a ton of drug addicts with mental health disorders. There is a CORRELATION. So, now, what does a drug addict do when they have a drug problem and a mental health problem and they want to change? THEY deal with it. They get help for both their drug issues and the underlying problems that led them to using in the first place. There is little their partners, family members, friends, or anyone else can do to really rectify the problem. They have to want to change. What does a drug addict do when they are caught out, when they are not ready to change? They blame shift. They lie. They argue. They avoid. They rug sweep.
Having lived with a drug addicted family member for about 5 years during their struggle with getting clean, I heard many of the same kinds of lies and dealt with the same behaviors that my WH did when he was caught cheating. He also did not want to stop - or maybe he did, but not enough that he was willing to go though the soul shaking self examination that is required to make actual change - he, as he now says, couldn't get out of his own way. After he was caught the A continued, for another year, underground. He ended it multiple times (I have all his deleted texts to prove it as I wasn't believing him) and went back during that year, over and over and over again. He said after he was caught the first time he was not able to compartmentalize as well as he did before, so he felt crappy on most days, taking to her, talking to me, and the worst was when he was alone and had nothing to distract him. His depression worsened, his anxiety worsened, and it was just a downward spiral - yet he persisted in the A - stuck in a cycle because there was a part of him that just didn't stop. He said the internal struggle was terrible near the end and he fantasized about just running away, because what he was most afraid of, aside from conflict, was that everyone would find out what a flawed, scared, messed-up person he was.
He said none of this to convince me to stay with him. In fact I did not. But only upon my leaving (the A was over and blown up at his work about 9 months earlier) did he decide he needed to figure out what he needed to do to change. He committed to IC for HIMSELF not for me. He has dug into his background to try to figure out how he got here, and he sought treatment for his depression and anxiety in earnest in conjunction with his IC. HE DID THESE THINGS and there was nothing I could do to make him or help him or anything. Just like my family member who was the drug addict, he had to have the moment of clarity where he decided he did not want to be this person and he sought help, and just like my family member, I can see the change. He does not have to tell me - it's obvious.
That being said, my WH really wanted his depression to be the problem and therefore the solution - he wanted to be able to take a pill and be "better" - for things to be better. But that isn't all of it, and I think that's what some people are pointing out. Along with his depression, my WH has shitty coping mechanisms for all kinds of different aspects of life. He is conflict avoidant and has a very low capacity for empathy, both of which I think (I don't know) is from his upbringing - his family all the same in that way. For him getting his depression and anxiety under control allowed him to deal with the rest of it - to take a very harsh look at himself and how he handles stress, loneliness, worry, sadness - feeling uncomfortable - and to address it in different ways. My WH has admitted he had shitty boundaries prior to our relationship - I just didn't really know about them - so while to my knowledge his A (and the false reconciliation we had for almost a year and a half) was the only time he cheated on me, his cheating was not relegated to me alone.
All this is to say that in your WS's case, unless she wants to really do the work to figure out what inside her is causing her to do this - to be this person - there is little that you can do but "help her pack." What you can do is, as has already been said, get yourself some therapy to help you feel better about YOU as for most of us, this whole thing is a machete to the self esteem. Protect yourself as best you can and IF she is willing to do the work in earnest you will know - you can tell - and you have to decide if you want to wait while she goes through that process or walk away. Put yourself first and make an exit plan, not because you know what you are going to do right now, but so you can leave if you decide you need to.
If your WS is not willing to address her issues, you will likely just continue the cycle. In other words, if she doesn't want to figure out why she is like this and to the extent her mental health has in any part in this to address that too, she is not a safe partner for you (or anyone). So, to the extent you are not sure what to do, watch what SHE does. It's not an easy path - I'm sorry you have to travel it with us - but you are not alone.
[This message edited by ThisIsSoLonely at 3:08 AM, Saturday, February 4th]