The heart shape (♥) is an ideograph used to express the idea of the "heart" in its metaphorical or symbolic sense as the center of emotion, including affection and love, especially romantic love.
Accordingly, why does the heart represent love?
Ancient Egyptians, for instance, believed that the heart epitomized life and morality. The Greeks held that it controlled reason, thought and emotion. It's possible that the Greek association of ivy with the god Dionysus (the god of sensual things) led to the heart being identified with romantic love.
Why did the heart become the symbol for Valentine's Day?
The ancient city of Cyrene, which grew rich from the silphium trade, even put the heart shape on its money. Since the human heart has long been associated with emotion and pleasure, the shape was eventually co-opted as a symbol of romance and medieval courtly love.
What does it mean when someone texts you a heart?
A common usage of the red heart emoji is to convey affection or love. In this slogan, the heart is a stand-in for the word love. If a text says “I u,” it can be read as either “I love you” or “I heart you.” Especially when used at the end of a statement, the red heart emoji expresses affection or love.