Good luck, dear. Spend as much valuable time with the kids as possible.
If she feels threatened, as you stated that she felt you were 'out to get her', she just might get the idea to use the children as a weapon, therefore hurting them in the long run.
Follow your heart as best as you can, but don't let your pain get in the way of an amiable solution.
Sorry that she was not willing to join you in seeking professional help to try and save the marriage. This does in a way show that she did not really care to save it, but also wanted time to be at her advantage.
So, in a way, after she caught you by surprise, you surprised her by forcing her to make up her mind a little faster.
Keep on this forum and let us know how things go. Good luck.
http://smileys.smileycentral.com/cat/15/15_9_16.gifWhen you get the time, tell us a little about the children.