What leads to suicide?

Three old examples

Clouds roll over the mountain, a bride unveiled in the morning.

I remember my son sitting on the porch steps the evening before, watching birds get their fill of insects in the golden dusk.

Life is precious.

Somewhere, all life knows this until the moment it dies.

Yet, suicide has been with us for some millenia.

In The Iliad, after Achilles' death, Odysseus receives Achilles' magical armor instead of Ajax. Stricken at the lack of glorious reward despite his status as one of the Greek Champions, Ajax stabs his own heart out of grief.

When his city condemns him, Socrates drinks hemlock.

And from an ancient Egyptian torn with inner conflict, we have the last clue:

Faces are blank. Every man hides his face from his brothers.

I am laden with misery for lack of an intimate friend.

The evil that scourges the earth is without end.