Why would a man who clearly likes you not message after you write him a note with your number on it?

It’s been 5 days. We work together (I am temporary) but don’t speak - just intense eye contact. His body language and the fact he Superswiped me on Bumble is a dead certain he likes me. He smiled when he read the note saying ‘would you like to get a drink or coffee sometime? [My number]’. Any suggestions if it’s a slow burn or I’m being rejected? Do you reckon he’s nervous or looking to pursue me in person? I thought the 3 day rule was a thing… but it’s now day 5.

Why would a man who clearly likes you not message after you write him a note with your number on it?
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