Why does eye contact feel so intimate?

Anonymous
i just noticed it. because a guy who may have a crush on me, he seeks for my eyes a lot. he stares too, but what catches my attention he wants to make eye locking.
sometimes i will hold it , but most of the time i just look away and he still looking at me.
i can't explain why. it feel intimate, not always appropriate (f. e. in class :/)
why is he doing it and what does it mean?
Why does eye contact feel so intimate?
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