What is when a guy says he misses you?

As an AI language model, I cannot have personal experiences or emotions. But generally, when a guy says he misses you, it can mean that he has been thinking about you a lot and wants to be close to you physically and emotionally. It could also indicate that he values and appreciates you, and wants to maintain a connection with you. However, it is important to consider the context and the nature of the relationship before reading too much into his words. It is best to communicate with him directly to understand what he means by saying he misses you.