People sometimes bite their fingernails when they are anxious. this is one example of

a manipulator A manipulator knows how to get what they require with little exertion from themselves however at great cost to others. They discover approaches to work around things for their advantage. A manipulative individuals invest a great deal of time and vitality making a situation where they can control the result, so their requirements are continually met by others. The most concerning issue of a manipulative relationship is we frequently don't know it's going on, and we enable it to proceed.

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