i assume a lot of it has to do with how when you feel a deep love, you feel a warmth in your chest. when you experience heartbreak, you feel pain in your chest, where your heart is. when you are anxious and worried, you feel tightness in your heart. people have probably been experiencing this since before words were invented. think about it, when was the last time you felt a strong emotion and felt any physical stimuli in your brain? we know now that this is where thoughts and emotions happen but until very recently, i think it’s easy to see why people thought all of that happened in the heart. that’s been part of human culture for such a long time, it’s not going away any time soon.
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