I think that it has a quality to it that so many of your other pieces couldn't quite grasp.
I like the way that it is both yearning and mature at the same time, needy without being childish. Good Job with that.
I think that this is something so many people could relate to.
As for being unfinished, I would leave it as it is, because if you added too much more to it then it would be too forceful, too needy. It has just the right resonance with that last line, a great ending for a very lovely piece.