This is why it is SO IMPORTANT to detach and GAL. I think we just can't accept that our W really doesn't give a dam* about us. We try to do loving things, and they're just like "whatever" if they even notice at all! When my W was sick in bed, I could have easily just ignored her, staying in the family room watching TV, playing with the kids, playing guitar, talking on the phone to my friends, etc. She wouldn't have even noticed, let alone cared.
If they've really thrown the M overboard, we have to do the same, for our own sanity. Doesn't mean we're closing the door on a future reconciliation, but we have to preserve our self worth and have the attitude that their actions don't warrant love in return.
I have dated quite a bit, but not seriously. It has done wonders for my ego and has put me in a much better emotional place to deal with my W. She definitely noticed and started pursuing me. Pretty funny actually.
After almost a year of this, I'm finally starting to see real movement back toward me and our M. The luster of her fantasy is gone, and reality is sinking in. I don't know if we'll end up together, but my W now realizes that she has much blame in all this, and that our M is not something she necessarily wants to throw away. She has said things to me lately I thought I'd NEVER hear. Makes me wonder what's next!