Why would a guy watch your social media for years without any communication?

I know someone well over 10 years. And over those years we both expressed intrest and attraction but i was clouded and not really paying him no mind.
I guess he was trying to send clues online but i honestly wasnt paying any attention.
Now fast forward to now i have feelings and really want to re connect but hes playing dumb and ignoring me. Why? He watches my socials all day and night and now that i put some motion behind my actions you ignore? Whats going on?