Why would he pretend not to see me?

Anonymous
A man at my work who I have a crush on walked by me the other day in the street. He does not know I have a crush on him. We were not even a meter from each other. When I looked up he immediately looked the other way so he did see me but blatantly ignored me. I don't know him that well but we know who each other are as we are in the same department. Why would a grown man behave in that way he could have at least smiled or said hi not pretend he didn't see me. He does look at me and acknowledge me at other times. It was just odd.
Why would he pretend not to see me?
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