You've gotten a lot of great advice here. I think you simply weren't prepared for the setback, believing you were on the road to reconciliation. No one would blame you for thinking that. I'm sorry for this setback, but it isn't necessarily the end either.
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I don't want to be "out of sight, out of mind" with her.
If you really believe that she feels that way, why would you want to R with her in the first place? I can't think of a bigger cut than being "forgettable" to someone. I understand your fear, but wouldn't you rather know the truth now, rather than suffer more pain/stress/anger/frustration while hanging onto hope for the impossible?
Have you asked yourself the tough question of whether perhaps your W was only doing this to acquire another baby? I would hate for that to be the case, but she sounds desperate, and desperate people do desperate things. And you have "been there" for all of her other demands, perhaps she thought she could sweet-talk you out of this, too.