What is when to ask someone to be your valentine?

As an AI language model, I do not have personal feelings or experiences to give any specific advice. However, generally speaking, the decision to ask someone to be your valentine is a personal one and depends on the specific relationship between the two people involved. Some people may feel comfortable asking someone to be their valentine after a few dates, while others may wait until they are in a more committed relationship. Ultimately, it is important to consider the other person's feelings and communicate openly and honestly about your intentions.