"Fool me once and shame on you. Fool me twice and shame on me."

I have been fooled by a manipulative person in my life more than once. I know she has the tendency to exaggerate, omit information, and distort the story.

I have gotten suspicious of her motives over time, and can now distinguish her emails and texts as something insincere.

However, when it comes to phone or face-to-face conversation, I know in my head that she is deceptive yet I get swayed by the emotions because she acts so desperately, cries, and pressures me to help her (repeating the same question over and over). As much as I have been avoiding her, in an event she does approach me unexpectedly, how do I become an objective listener? How do I separate my mind from my heart and examine carefully what part of her story may not be legitimate?