Buddy, I'm sorry to see what you're having to deal with here. One thing I want you to remember is that you will always be "1st Rate" to me and to the others here as well. From reading your post here and on other threads I know you are a good, no GREAT, person and no one can take that away.
Other than marrying someone who had previously been married our backgrounds are very similar. I know what it's like. I also know what it's like to reach that point of saturation where you feel you can no longer take any more. The OM sitch is something she has to deal with herself. I don't see where there is anything you or anyone else can do about it. Unfortunatly for her this may be driving away the one person who really does care.
My friend, take care of yourself. Be the kind and loving KAW that we know here on the BB. If the sitch works out then great but know that you are one helluva guy.