You have a plan, follow it through. Keep your dignity and self respect, no matter what happens.
Thanks for the very kind words and the above advice/reinforcement, Atlas. We're all just doing our best with what we've got, aren't we...
I really have gotten to a point where I know I'll be happy without her, but I still struggle with the thought of OM giving my kids advice, helping to raise them, teaching them things, playing with them, etc, when those things are supposed to be done by me. I don't dwell on W and OM's intimacy anymore (should say "very rarely" if I'm honest), and it sure has helped having people (and myself) put that all into perspective. I truly do believe that she will come to find that OM isn't the white knight she thought he was or the silver bullet that would end her unhappiness. I don't know if she will want to come back or not after that, but the knowledge that he alone can't make her happy has given me back some dignity and helped to quell my sense of rejection.