He told me he is my secret admirer. What did he mean?

This guy knows I like him as I told him I have feelings for him. I'm sure he was not joking around when he said this. Does it mean he likes me too? Or it's just that he admires my personality or things like that? Or it's just a sweet way a guy does to flatter a girl?
He told me he is my secret admirer. What did he mean?
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