Both seem OK to me.
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Anonymous our textbook suggests that "being disappointed" is correct,Native speakers generally omit 'being' in such structures if possible.
Anonymousour textbook suggests that "being disappointed" is correct, since the sentence has got an active meaning.disappointed is an adjective here, not a verb, so there's no danger that the reader will understand the meaning as a true passive even if you leave out 'being'. It's not as if the 'outcome', an abstraction, played any agentive role in the
CalifJim, forms of 'be' tend to sound stylistically weakThat's the phrase I was looking for!