Why would he stand directly in front of me, facing me and stare deeply into my eyes and not say anything?

My crush, at university so we're both in our early twenties, well he would always act strange around me but be just fine with my friends...one day we bumped into each other and I was with a friend, he was speaking to her but the whole time he was looking at me and just staring deeply into my eyes and not saying anything to me...it was almost as if he was trying to intimidate me!
Why would he stand directly in front of me, facing me and stare deeply into my eyes and not say anything?
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