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I think 'butterfly' is sometimes used in that sense.
PG Wodehouse used "butterfly" in that sense (through the voice of his characters) to describe someone who "flits from flower to flower" (IIRC) i.e., someone who is unfaithful or moves through partners rapidly. So it's an expression with pedigree @ewanmac, if not exactly current.
Yes, that comes from Socrates.
https://en.wikipedia.org/wiki/Gadfly_(philosophy_and_social_science)
I think there is an expression, although I can't think of it now, either. I'm not sure it's a fly, but I think 'butterfly' is sometimes used in that sense. It's not what I would call a classic expression, though.
Not sure, that's generally used for something ephemeral rather than as ewanmac describes.