Sorry Wii - I'm sure that hurts. And I'm suspecting she was probably "involved" somewhat all along. I know you believe otherwise but I honestly think she thought of you as a friend and enjoyed your attention. Not the message you were receiving and maybe she should have been clearer.
I still think it is time to reread your thread and see what the rest of us were saying early on. Go slow. Relax. Don't introduce someone new to your kids or let your ex know about them. And keep them off FB!
I also hope you have a good w/e. This will pass quickly but you know how much you enjoyed having someone in your life. Go find someone who will appreciate the great guy that you are!