dittany
I would like to explain why I can rationalise (and attempt to forgive) his actions, but that I am unable to rationalise hers. I imagine this would apply to lots of affair siutaions.
I've known DH for a very long time and I am aware of his good points and more relevantly here, his not so good points. I have lived with him for such a long time and been through so much with him that I have seen how he behaves and what feelings he has. I know about his childhood and the events that shaped him. Therefore, having worked at it by using this knowledge and grilling him, I am able to understand his actions. Although obviously they were wrong (understatement!), I can understand the "logic" (ironic!) behind them. The OW - I've met her once and know a few things about her. I don't know her well and I don't know about her life so it is not possible for me to rationalise her actions in any more than a generic manner. This is why I put in my OP that I think she should be ashamed of herself - because it is the default which is probably correct for the majority of people who have had affairs. This includes my DH obviously, he should feel ashamed of this particular situation until the day he dies. The OW - I don't need to understand it from her perspective because like you have said, if it wasn't her, it would have been someone else (so her personal perspective is not relevant to me or to the recovery of my marriage), we had fundamental marital problems which were due 100% to me and DH. Perhaps I have also failed to express myself properly. My aim in mentioning her in the OP was firstly that I don't feel anything much (other than the shame) for her now, and secondly to give a better picture of my circumstances so that people could help me. I have only subsequently mentioned her in order to clarify things in response to other posts.
FWIW, I do think, like WWIFN and others have said that she had a certain amount of responsibility to me - she knew I had 2 preschoolers etc. She had a responsibility to me as a fellow human being - it is not acceptable to go around doing things to please yourself when those things destroy other people. Shame is a reasonable emotion for me to feel towards her IMO. And far healthier than me wanting to interfere in her life/do something to hurt her in some way.
I have definitely not got my anger projected onto her. My initial anger has reduced and cannot be shouted at DH continually. It can be sometimes, but not all the time, otherwise we can't recover. I am still angry with DH and on these occasions when I have to, I rant at my mum who is happy to help me and understands why I should not rant at DH every single time I feel like it. I might say to him later on in the day, I had a bad moment, I've ranted but we are still going to press on together.
To those who've mentioned DH's job - yes, in an ideal world, he should change it. But, as I am a SAHM with preschoolers, we are currently reliant on the one income so we cannot risk it. It's hard, but at this point in time, I think that we can tolerate it. I do trust DH now - even if the OW offered it on a plate, DH is confident that there is no way he would ever go there again. Not with her, not with anybody.
ducati - that is a really nice story. I hope me and DH can get there!
Regarding "failure". Neither of us have failed at the marriage because we are still hanging in there and we are going to fix it. We nearly failed, but we didn't. DH has failed himself in that he has broken his own moral code and hurt people he loves. He is going to have to try and forgive himself for that which is going to be very hard.
Thanks to everyone who has made positive comments as well. It is uplifting to hear that people think we are on the right track. Also, underlining to me that I am not aiming to get things to "normal", I am aiming to get the marriage solid and need to accept that bad thoughts and work towards decreasing their frequency. The negative comments are also welcome, I cannot bury my head in the sand and I do need to examine what we are doing so that I can be sure that it's right.