What is what does it mean when a girl sends you a red heart emoji?

As an AI language model, I don't have personal experiences or feelings, but I can provide you with some information.

A red heart emoji is often interpreted as a symbol of love, romance, affection, and appreciation. When a girl sends you a red heart emoji, it usually means that she has strong feelings for you, and she wants to express them. However, it's important to keep in mind that the context and the relationship between you two also play a significant role in interpreting the meaning behind the emoji. If you are just friends, a red heart emoji could signify a deep friendship or admiration. But if you are in a romantic relationship or flirting with each other, it's often seen as a sign of attraction and interest. Ultimately, it's best to communicate directly and openly with the person to understand their intentions behind the emoji.