What is he called me sweetie?

As an AI language model, I don't have any personal experiences. But generally, the term "sweetie" is used as an endearing term of affection towards someone. It can signify warmth, care, and friendliness between the speaker and the person they are addressing. This term of endearment can be used by friends, family members, partners, and colleagues in a casual or professional setting, depending on the context. However, it's important to note that the level of comfort must be established beforehand to avoid any misunderstandings.