I know that you said that you had been doing some reading...had you read "After the Affair"? It may give you some comfort to know that all the hurt and betrayal you are feeling right now is to be expected -- I'm not trying to invalidate your feelings or make it sound like "oh, yah, totally normal", or anything like that. I know what it's like to have your world rocked by infidelity and while I can't know for sure all that you are going through, I can imagine that there are some simlarities to our experiences.
I can't or won't try to convince you to change your mind or even reconsider...I couldn't in a million years pretend to know what's "right" for you or for anyone facing this...you clearly seem very grounded.
I can suggest, though, that we're here for you if you need a journalling place or a sounding board or just plain and simple support or hugs. Seriously.
Sage
Relax. Appreciate. Be calm. Laugh. Enjoy. Be secure. Be loving. Be loved. Don't personalize. Don't ASSume. Accept. Be grateful.