Why does he always smile and laugh when....?

partygirlxoxox
okay so this guy, every time I talk to him he always smiles and laughs even when I'm not being funny and I'm like dead serious and when I talk to him he is like wait what did you say but it seems like he is listening to me when I talk because he looks concentrated on me but...what does this mean?

Why does he always smile and laugh when....?
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