Why was his heart racing?

So I like this guy, and today I saw him standing in the halls, just standing, not moving, and I walked up to him and kinda talked to him, then I went ahead and gave him a hug.. except I noticed that when I put my head against his chest, his heart was like racing.. not like unbelievably fast, but fast... WHY? I mean I don't know if he likes me or not, but is this a good sign that he does, or was this just a coincidence, and I caught him at a bad time, or maybe his heart has a really fast beat? I don't know but I do know that it was thumping unusually fast.. WHAT DO YOU THINK?
Why was his heart racing?
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