Subtle signs that a guy likes you?

Will keep it brief. I work with him, I get the impression he hasn’t dated too much, I don’t think he has any real idea I fancy him but I’ve definitely subtly implied it, so I have 2 questions:

1.) what are very subtle signs that a guy fancies you?

2.) how do you flirt without being overly blatant?
Subtle signs that a guy likes you?
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