What's "Youve Got To Hide Your Love Away" About, Anyway?

It sounds, at first blush, as if Lennon is singing about himself in the
verses and *to* himself in the choruses.
Why would Lennon, however, have felt any need to hide his love away?
The Beatles' friend and biographer Tony Bramwell wrote that the song was
written about Brian Epstein, who strove to keep his homosexuality under
wraps -- although in most footage it seems pretty obvious.
Any other possibilities?