Why might a person act one way in one relationship and differently in another?

like w t f just f en search it up then there u go

There are two main reasons why someone will behave differently with you. The first reason relates to anxiety, insecurity, or trying to impress you. These men and women have a deeply rooted fear or insecurity that you may not like them as they are. They feel like they need to act a certain way in order for you to like and approve of them. The second reason, however, is darker and more emotionally dangerous.

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a person might act one way in one relationship and differently in another because each relationship has its own rank. E.G A person might share a secret with his friend that he won't share with his brother

obviously, the latter.

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