Well, you seem to be conscious of the possible manipulation, abuse and of what they might be indicators, which is most essential and will literally, probably save you from further abuse, manipulation and control if you so choose.

You have a decision in front of you, sky457: to continue with her or not

Also, please allow me to just state to please not underestimate, downplay, ignore or anything similarly how your well being (physical, mental, emotional, spiritual) might harmed if what we are discussing is indeed accurate about your ex girlfriend.

If you choose to not continue with her and no contact at all, you might consider telling her a most brief message of how the two of you are done, wish her well and so on, then block her on every avenue of communication OR you block her right away without saying anything. Be warned that she might even attempt to find you in person if she cannot contact you in any other avenue.