Why Is This Shape Called A Heart?

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SOURCES AND FURTHER READING
Heart On OED: https://www.oed.com/view/Entry/85068?rskey=koTPMm&result=1&isAdvanced=false#eid
Heart On Etymonline: https://www.etymonline.com/word/heart
The Origin Of The Heart Shape: https://www.thevintagenews.com/2017/03/10/the-origin-of-the-heart-shape-ideograph-as-a-symbol-of-love/
Why Do We Associate Love With The Heart?: https://www.huffingtonpost.co.uk/entry/heart-symbol-love_l_5dc0170fe4b0615b8a962dc5
Chest pains When Feelings Are Hurt: https://www.scientificamerican.com/article/what-causes-chest-pains/
How did the human heart become associated with love?: https://ideas.ted.com/how-did-the-human-heart-become-associated-with-love-and-how-did-it-turn-into-the-shape-we-know-today/
Why Do The Hearts We Draw Look Nothing Like The Shape Of Real Hearts?: https://www.scoopwhoop.com/Hearts-We-Draw-Look-Nothing-Like-The-Real-Hearts/
A Brief History Of Pictograms & Ideograms: https://saffroninteractive.com/a-brief-history-of-pictograms-and-ideograms/
Origin Of Playing-Card Symbols: https://www.theatlantic.com/technology/archive/2017/08/the-lost-origins-of-playing-card-symbols/537786/
History Of Valentine: https://www.collinsdictionary.com/word-lovers-blog/new/happy-valentines-day-we-take-a-look-at-the-etymology-behind-the-word-valentine,351,HCB.html
Valentine On Etymonline: https://www.etymonline.com/word/valentine
Valence: https://www.dictionary.com/browse/valence