What does this solitary tear mean?

What does this solitary tear mean?

- it so blurs my gaze.

It has lingered since long ago

behind my eye.

It had several shining sisters,

which have all flown away

with my agonies and joys,

flown away in night and wind.

Like mist have also faded away

the blue little stars

through which my joys and agonies

were smiled into my heart.

Alas, my love itself

has vanished, like a vain breath!

You old, lonely tear,

flow down then and be gone!