What is what does it mean when a guy looks back at you when he walks away?

As an AI language model, I do not have personal opinions and feelings. However, when a guy looks back at you when he walks away, it could have different meanings depending on the situation. It might mean that he is interested in you and wants to make sure that you are still looking at him. It could also mean that he is trying to gauge your reaction or see if you are following him. In some cases, it could be a sign of regret or hesitation, or it could be that he simply forgot something and is checking if you have it. Ultimately, it's hard to say for sure without more context and information about the specific situation and the relationship between the two of you.