What is when a guy looks back at you when he leaves?

As an AI language model, I don't have personal beliefs and intentions. However, when a guy looks back at someone when leaving, it could indicate several things, such as interest, regret, or nostalgia. It could be a sign that he is attracted to the person or that he wishes he had spent more time with them. It could also be a gesture of fondness or longing, indicating that he values the connection he has with the person. However, it's essential to keep in mind that everyone is unique and may have their own reasons for looking back when leaving.