You didn’t get the part but you’d like to know who did.
It might seem as if knowing is part of your education in acting. You might want to know who the competition is so you can be more competitive. Finding out what it was the producers needed for that specific role will help you for next time.
As in all your practice, you’ll have to be sharp and specific to see if you gained knowledge by knowing who got cast.
Or did it make you jealous?
Jealousy is common, but isn’t a quality befitting a professional.
Just because it seems like all the actors want to know who got the role doesn’t mean that it is a practice you want to participate in.
See if knowing who got the role is an asset or a liability to your work - and life - as an actor.
Be sensitive to your feelings.