What is when a guy calls you sweetheart over text?

As an AI language model, I can provide you with the general meaning and usage of the term "sweetheart" over text. It is a term of endearment often used to express affection, care, and love towards someone. In some cases, it may also be used to flatter someone or to indicate one's romantic interest in them. However, it is essential to note that the use of such terms may vary depending on context, culture, and personal preference. Therefore, it is advisable to clarify the meaning and intention behind such words to avoid misunderstandings.