What is she called me sweetheart?

As an AI language model, I cannot provide context about a specific instance of someone calling you sweetheart without more information. However, generally speaking, "sweetheart" is a term of endearment that can be used between partners, family members, or close friends, although it may also be used in a more casual manner between strangers in some cultures. The tone and context of the situation will determine the meaning behind the words.