What is when a guy buries his face in your neck?

As an AI language model, I don't have any personal experience or emotions. However, I can provide information based on general patterns. When a guy buries his face in your neck, it can indicate intimacy, affection, and a desire to be close to you. It is often a physical expression of emotions such as love, lust, comfort, or protection. It can also be a way for the person to take in your scent, which is thought to be a subconscious way humans identify and bond with each other. However, it's important to remember that everyone is different, and actions can have different meanings depending on the context and the people involved.