She's going out

[TranquillityBase]

You wipe lipstick
from your teeth
with a finger toothbrush,
I watch ash confetti
fall slowly in to the hearth,
snow flakes on a coal fire.                    These are beautiful lines, but I'm not sure you need them for the story you are telling.

You lean forward
to slide on a red shoe
that was polished clean,
with spit from a dry mouth.

You smooth yourself thin
by breathing in,
the mirror above the mantle piece
watches your mouth hold a smile
but reflections won't let it be happy,
it falls back too quickly
to anxious.

You'll be alright ?
you ask like a statement
and I sigh and draw out a yes
so you think I will be.

Later when the door light
slices the two dark halves
of my bedroom,
you'll whisper loudly
he's asleep                                       maybe some quotes around "he's asleep"
and the second stair tread
will creak twice
as you touch my hair.                      these lines gave me to most trouble understanding.  i'm reading it now as she came home with another lover.  The stair creaking and then "you touch my hair" caused me to think twice about what exactly was happening.

In the morning
we'll pour quiet milk on bland cereal,
you'll carry your mothers guilt
while I try to sew fresh flowers
back on to your dressing gown.

At supper time
you'll say we're alright
but it's really a question
and I'll sigh and draw out a yes
so you'll think I don't care.

I don't have much to recommend as for edits to your poem.  It reads very smoothly although it did take multiple readings before the picture became clear.  It's a good poem.  Thanks for sharing.