Why was his heart racing when we hugged?

Anonymous
We are both in love with each other and today we had out first hug. He was breathing very rapidly and his heart was pounding through his shirt. I asked him if he was nervous or something, but he said no. Why was his body reacting that way to a hug? We hugged for like two minutes and he was still breathing heavily.
Why was his heart racing when we hugged?
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