Mistaken

mistaken (by vikram seth)
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i smiled at you because i thought that you
were someone else; you smiled back; and there grew
between two strangers in a library
something that seemed like love; but you loved me
(if that's the word) because you thought that i
was other than i was. and by and by
we found we'd been mistaken all the while
from that first glance, that first mistaken smile.