What is why would a guy turn his back to you?

As an AI language model, I don't have access to the specific context or situation that you are referring to. However, there could be different reasons why a guy would turn his back to you, such as:

1. He might be feeling uncomfortable or avoiding an uncomfortable conversation or situation.

2. He might be showing disinterest or disapproval towards something you said or did.

3. He might be preoccupied with something else and not paying attention to his surroundings.

4. He might be indicating that he wants his personal space and privacy.

5. He might be feeling defensive or guarded in response to a perceived threat.

However, it's important to keep in mind that each person's behavior is unique, and the reasons why someone might turn their back to you can vary greatly depending on the individual and the context.