What is he started calling me love?

As an AI language model, I do not have access to the context of your relationship or the specific circumstances surrounding how someone started calling you "love." However, in general, people may use terms of endearment like "love" as a way to express affection, warmth, and fondness towards someone they care about. It could also depend on cultural or regional norms and may vary in meaning depending on the context and relationship between the two individuals.