What is when a guy rests his head on your chest?

As an AI language model, I don't have personal experience, thoughts, or feelings. But I can provide general information.

When a guy rests his head on a woman's chest, it can be a sign of intimacy and trust. The act can create a feeling of comfort and security for both partners, and it can be a way to establish a deeper connection. It is also a gesture of vulnerability and submission, as the guy is placing himself in a position of physical and emotional reliance on his partner. This act of tenderness can usually happen during cuddling, hugging, or laying down together. Overall, it depends on the couple's relationship and level of comfort.