What does it mean when a guy smiles at you when you're talking to them?

Anonymous
I was talking to this guy in my 7th period class and while I was talking to him, he was smiling at me. What does that mean? I'm not making this a big deal I just want to know. No rude comments D: @Paris13 , @Applefan1 , @smahala1991 , and @scuff1986 can you answer this question as well :)
Updates
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UPDATE: I forgot to tell you guys that I was looking at something else and I could see the guy looking at me from the corner of my eye so I looked at him and he was just smiling at me :P
What does it mean when a guy smiles at you when you're talking to them?
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