She may of being playing you, but, you let her. You knew what she was like, past behaviour is an indication of future behaviour. You know that. So its your responsibility to protect YOU. Not hers. Up to you to say no isn't it?
Anyway, what's done it done. What's next?
Im rocking up to 4 months of NC now Out Of Time, so would you be if you'd kept to NC.
Im pretty sure I'm feeling a hell of a lot better than you right now.
Please stop doing this to yourself. Its self inflicted torture!!