Guys, How do I know if a guy likes me? What things do you do to drop a hint to a girl that you’re interested?

I was totally into this guy at a wedding but had no idea if he was interested so I left it and I left without saying goodbye. I’m still regretting it like a week later and I wish I had just got his number. Guys, what hint do you drop that you like a girl? - so I can look out for them in future

Guys, How do I know if a guy likes me? What things do you do to drop a hint to a girl that you’re interested?
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