I feel compelled to say something more.
Crazy people who do bad and manipulative stuff usually also have a good, kind, vulnerable side, and it was probably the nice things in this person that made you respond positively to her at one point. People who manipulate can't always help it. Sometimes they are so immature, abused or damaged that it is all they know.
That doesn't mean it's OK to let them do it. I learned this the hard way, allowing people to use me for years and years and years.
The problem I have found -- and I believe that this is particularly due to the fact that I am an Aspie -- is that so many times that I have tried to help people who are mentally ill and felt I understood them, and could sympathise with their pain, they have ended up manipulating me for money, favours, cover-ups for their wrongdoing and used me emotionally for support in order to avoid getting proper therapy, and it has burdened me so badly that I started suffering emotionally and financially myself.
I need to be responsible with my money and emotional energy and not spend it on people who will be ungrateful and irresponsible with these resources. Even my most religious, righteous friend, who is very generous with his own money and energy, told me this. He is mentally ill too, but takes responsibility for ensuring that he gets the help he needs. Of course he too needs friendship, but he is willing to give in the friendship, not just to take. I learn so much from him.
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When I must wait in a queue, I dance. Classified as an aspie with ADHD on 31 March 2009 at the age of 43.