What is what does it mean when he calls me kitten?

As an AI language model, I cannot speculate about a specific person's intentions, but based on general usage, calling someone "kitten" is often seen as a term of endearment or affection. It is often associated with sweetness, playfulness, and innocence. Some people may use it as a playful nickname for someone they care about. However, it is important to note that the connotation and meaning of a nickname may vary depending on the relationship and context. Therefore, it is best to communicate with the person and clarify the meaning behind the nickname if it is unclear or uncomfortable.