Why Did Hemingway Kill Himself?

We’re all going skiing today.
We adults are apprehensive, not sure how our old bodies will react.
I stand on the porch with my coffee and gaze out:
the lake is a shimmery blue;
the mountains, almost black, divide the lake from the blue sky.
The wet bark and boughs of the pines near the cabin
frame lake, mountains, and sky—
on the mountains white patches of snow.

Why did Hemingway kill himself when he wasn’t dying?
What did he wake and see in the mirror one morning?
What was he afraid of?
Was it death?
He feared death so much that he ran into her arms to escape the fear?