Have you taken anyone for granted?

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Being the introvert that I am, I have this tendency to shut myself off which eventually lead to taking things/people for granted unintentionally. This is the one thing that I'm struggling to change about myself. I do not have the intention to hurt anybody but somehow inadvertently, someone gets hurt along the process. Have you taken anyone for granted? Whether it be intentionally or unintentionally. What did you do do rectify this? Has this affect your life? How do you plan do go about this problem?