Why she smiles all the time do you think?

There is someone around me who always smiles at me. I never smiled back either. Then he smiled at my friend next to me. I didn't notice while we were chatting. My friend also told me why he was smiling. I looked at the smiling person and smiled and said, "Well, I don't know either." He was looking back and smiling while I was saying this. What do you think about it? Why she smile all the time?

Why she smiles all the time do you think?
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