For some reason as I read this piece, I figured the gun wasn't loaded... You made it obvious that this was a total stranger to the character so what would have been the motive for wanting the character to actually kill himself (other than just getting some sort of enjoyment out of seeing the character suffer)? While there are people like this in the world, more so now than ever, usually with something like this there is more of a motive.
Anyway, I think you did an excellent job of relaying the characters strong emotions in this piece, and to a point, it is believable. If I was put in the same situation, best believe I'd have put the gun to my own head and pulled the trigger.
The ending was so very sad and I wished it had a better outcome, but once again, though sad, it is believable. You kept my attention though out the entire story with the descriptions you gave of the characters, their surroundings and their emotions. The title matches the story well without giving away too much information about what the story is about.
I would only suggest maybe changing the description to something that relates to the story instead of the explanation of why it is short. Also if you plan to keep the description you may want to change the "an" to "a". Otherwise, though it is a heartbreaking story, I did enjoy the action, drama with in it. I look forward to reading more of your work in the future and I hope you continue to share with us here. Thank you for sharing and as always, please do Write On!

All the best to you,
Midnite