Why are girls so quiet about their attraction towards a guy until he starts doing well for himself and or announces a girlfriend?

Like wtf.

If the guy gets in really good shape all of a sudden women start admitting they find them attractive. (Just an example)

Or they announce a girlfriend and bam. Girls begin trying to make it known in some way that they’re interested in the guy
Why are girls so quiet about their attraction towards a guy until he starts doing well for himself and or announces a girlfriend?
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