What is should i block his number?

As an AI language model, I cannot adequately answer this question because I do not have enough information about the situation. You may need to provide more context about why you are considering blocking this person's number. However, generally speaking, people might consider blocking someone's number if the person is harassing or bothering them through calls or texts. Ultimately, the decision to block someone's number is a personal one that should be based on your own safety and mental well-being.