Guys, why was his heart beating so fast when we were hugging?

This one guy (I thought he only wanted me for sex) and I hugged a pretty long hug. I laid my head on his chest and said I felt so safe around him. I could hear his heartbeat and it was beating very quickly. Mine was slow because the hug was comforting. Does this mean anything you think since his heart was going 123 miles per minute?
Guys, why was his heart beating so fast when we were hugging?
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