The question "What am I to you?" is a personal question that can be asked in the context of expressing affection. It implies a relationship between two people and a certain mutual understanding and knowledge. The answer to this question will depend on the relationship between the two people. For example, if someone asks you this question, you could say "Youre someone who I care about a lot, and who I want to have a close relationship with" or "Youre someone who I respect and admire, and who I enjoy spending time with". Its important to be honest with yourself and with the other person when answering this question.