Third Edit: strange goodbye/long goodbye

[Todd]

Hi Richard, a few comments for you.

a light left on for someone--nice break on the first line.
who'll never arrive
door open--I think you're missing an opportunity here if you make the door be closed, even if it's "door now closed" then you could follow up with the "only the wind knocks" line and it would probably work better.
windows frosted--I like this as it is a strong image implying relational coldness
only the wind knocks
darkness watches--This is a great line. There is a sense of being watched when you are truly alone. I think that's captured here. That it is personified darkness gives it a sort of foreboding sense.
hopes to be invited in--This reads like vampire fiction which I think diminishes the idea of darkness (mood, emotion, energy level, depression, or some such residing in the speaker).
snow silent as loneliness--Love the simile. This is where I would end the poem, as the final lines below seem flat and blah to me. They wrap up the mystery and leave me not caring about the ending.

i blame myself
for being such a lackluster friend

I hope the comments help.

Best,

Todd