Why do some men avoid eye contact with me but smile when talking to me?

do they think I’m into them? Because most of the time I’m not. They also always notice when I look at them from afar (for instance when I stare at a fellow student who stands up or does something weird during an exam). And would then quickly look back at me. I just like to watch people so it doesn’t mean I’m into them

Why do some men avoid eye contact with me but smile when talking to me?
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