This is really good,
dark

Good ending.

Dark is the correct term for it.

And that’s a good thing!

Good and really dark. I like that it is a different take on the zombie genre, a bit more personal thus far. Good job that way.

I am a big fan of the character who does the ‘tough but necessary’ thing. Koodos.

Things to tweak: That first sentence. Nothing technically wrong, but all the commas make it a bit awkward even though they are used correctly. The fourth paragraph needs a bit more gut wrenchy-ness. Perhaps tuck her in and kiss her good-bye? The eyes squeezed shut is good, but needs a bit more.

Love the end. BAM – nice impact.