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amourfags got baited by Yajima's interview, and I can't really blame them if the director of the series says they were supposed to be a pairing in the future or something like that.
having said that, Serena's crush was part of her development and ended when she kissed him, from there the narrative completely changed, even the director changed, so, neither the crush or the kiss never got mentioned again because it didn't really matter anymore.
idk, maybe you should have listened to the multiple times they said Ash wasn't interested in girls.