Why guy stare one day and ignore next day?

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Why guy stare one day and ignore next day?

why would a guy stare straight into your eye(no smile) one day and completely ignore you the next day?

I have work with this guy for a year.. He used to get my attention (say hi every 5 minutes at work with me..that's weird). Yesterday , he stare straight into my eye and hold it without smiling..so I don't smile either. I just look away. Today, he completely ignore me. Is he a weird ?why did he do this?

Btw, I didn't talk much with other coworker..just keep working(i'm quiet).People say I have a soft personality. I'm always nice to other coworker..

Did he think I'm weird...so he just stare at me.? I need help..
Why guy stare one day and ignore next day?
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