So You've Grown Attached (15:03)
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This 2014 short film was presented by Dust in 2017; re-released in 2024.

A girl named Izzy has an imaginary friend named Ex. But when she starts growing up, and takes an interest in the boy next door, Ex (who doesn't speak, but has other ways of communicating) must decide whether he can bear to retire. He'd rather stay friends with Izzy forever, but as another imaginary friend named BearBear (who I guess is like an HR director for imaginary friends) tries to explain, keeping an imaginary friend forever can lead to negative consequences for humans. And of course Ex doesn't want to be the cause of any suffering for Izzy. Anyway, it's an amusing and very sweet film.