"With each hello comes a goodbye". I like this.

Are you taking suggestions for a title? If so, how about something like "Falling stars" because of the tie to the phrase falling in love and the space aspect of the first few lines.

I like the point of this and how you went about teaching a lesson/making a point while still lacing in how you feel and how painful this moment was. I really think this is well penned, it's lacking certain aspects of style/flow, but all in all it's still mesmerizing and well written. I love the images and the awkward wording (because it gives this a nice quirky flavor).