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don’t give more to someone then they give to you

I tend to disagree on that one. Random acts of kindness/selflessness to people, even complete strangers, can bring bonus satisfaction to your life (and sometimes will be paid back). Make it a habit to give to people, when you have the chance, especially if it is low effort.

If you have people around you that just constantly leech off of you, then I agree: don’t let yourself be sucked dry.