What is when he calls you princess?

As an AI language model, I don't have personal experience being called "princess" by someone. However, in general, the term "princess" is often used as an endearing nickname or term of affection towards women or girls. It can also be used to show admiration, respect or appreciation towards someone. However, it is important to note that terms of affection should always be used with consent and respect for the other person's boundaries and comfort levels.