KAW, I've also been in "lurk mode" while keeping up with your situation. I'm so sorry about this latest turn of events. You've been at this for so long -- and in some respects that is to your advantage. You are much better equipped to handle this now than you were two years ago. You will be just fine.
You posted above that if CAW would ever want to reconcile after having been with the OM that you don't think you'd be able to do that - you would feel that you were "second best." Remember that old saying, "We don't know what we have until we lose it"? Could be that CAW needs to "lose" you in order to remember/discover all that she already has with you -- that she most likely will never have with the OM.