I've posted this in previous pages before Rebirth was released out, lemme copy and paste again.
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I asked my friend about it, she has Bachelor Degree in Japanese Literature.
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Though, Aerith's motivation to pursue Cloud is romantic, because she saw Zack in him. But, it applies differently to Cloud whose personality need to grow first even as a friend (see how he's warmed up with AVALANCHE and Aerith is the same process), and it turns out even after two weeks, he just viewed her as friend. I guess this situation is confusing or difficult to Aerith while with Zack, it's clear a romantic love from the first meet. Nah, my friend said the koibito in the novel is platonic because is her thought, that she keeps her feelings only for herself. But then in Rebirth, she confesses it. So I guess, it's not platonic again? I dont think what Nojima write here is contradictive. So, she treasure both feelings.