Last night she wanted to make it clear to me that she wanted me to feel free to date other people if I wanted to, but that she didn't feel like we would ever be together again and as of now wasn't even willing to try.
I read a bit of your story, and while I cannot pretend to know what's in your W's head (other than fog), I can say that your story sounds very similar to mine.
My ex moved out saying that she needed to clear her head, and that it was not "the end". But in reality she maintained contact with OM, hoping to end up with him.
I went into Plan B, and exposed her affair, which promptly ended when his W told him that she will make sure he never saw his kids again if he continued the A - and of course he folded like a house of cards.
But, my ex did not come running back to me. Rather, she went into a tailspin, whining about "woe is me", how confused/messed up she was, how wonderful and great I was, and how not ready she was to be involved with anyone until getting years of therapy. I listened to her ramblings, but knew that actions were louder than words.
And her actions were that after a month of "mourning" and whining, she found another guy to date, whom she went on to marry. So much for "years of therapy".
Anyway, FWIW, this sounds a lot like your W - affair may be crumbling, but she does not want to try the relationship again. I don't know what I could have done differently, I think she had a lot of resenment built up, and had the attitude that "I never go back, always move forward" - something that I think really meant "I am too weak to admit mistakes, I prefer to run away from them".
I guess your actions would depend on what Plan you are in - if you are still Plan Aing, you can be the rock in her turmoil. I know I tried that, but I got so sick of her using me for support and then going out and hooking up with OM and then the new OM, that I would not necessarily recommend it. I think that if you do that, you will only make it easier for her to transition to single life, find another guy, etc.
I would go for a Plan B at this point - not to punish her, but to protect yourself and your sanity.
I hope this helps.
AGG