What makes you ‘click’ with someone on a date?

I’m talking general. Say you’re on a date but usually what might happen is you have a lot in common, it’s going well but you end the date with ‘ you seem lovely but I don’t think we clicked like that, but let’s stick to friends’

So what makes you personally click/not click with someone? Your own experiences
What makes you ‘click’ with someone on a date?
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