What does it mean when someone says take care?

Anonymous
At the end of a convo almost every human says take care to me after saying bye, even my coworkers, friends, customers, random strangers on the road and just everyone. I feel so sad when they say that, does that mean they hate me and they never wanna see me again or they just don't want me to bother them/talk to them anymore or is it a bad thing when someone says that? :( if not what does take care mean to you, when you say if at the end of a convo?
What does it mean when someone says take care?
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