I definitely prefer the open-ended nature of the poem. You do a good job of bringing in several of the senses, not just sight and sound.

I do have to quibble on one line:

That space where you should be so cold and empty.

really needs to be:

That space where you should be is so cold and empty.

The first version sounds like the missing person is supposed to be cold and empty. (Then again, maybe that's why they broke up ....) ;-)

Nicely done!