i think for the part where the boy choose to remain as a
dragonfly is to give the gal happiness.
what's the point of reappearing in front of the gal, tell her that
he still love her, force her to make a choice btw her hubby or
him??
tell her that he has been the dragonfly for her sake for the past 3
yrs, make her feel guilty??
that's selfless love. too bad, most ppl prefer selfish love

sometimes, when love dies, so does ones' will to continue his
normal way of life.
i think most ppl will choose to move on, if the person u love can
leave u w/o a word, maybe he/she aint the one for u.