Crush ignored me today why?

I found out someone had feelings for me at work so I left a note with a heart under their door and they figured out it was me. I saw them after a while and they said "Hey" with a smile when I ran into them. Today I was walking down the hall and I unexpectedly saw him we walked right past each other and he didn't even look at me nor did he say anything. I feel so confused and hurt now. Is there a reason why he ignored me?

Crush ignored me today why?
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