Oddly Enough, It's Funny
Overall, I thought this was pretty good. It told its story clearly and the music was fitting. The animation was okay and the art was suitable for this kind of piece. The only real problem I see is that the music cuts out all of a sudden. You should stream it next time.
**SPOILER WARNING - DO NOT READ PAST THIS POINT IF YOU HAVE NOT WATCHED THE PIECE!**
I understand via your Author's Comments this is based on a true account, but there was still humour in it. Whether intentional or not, the first time he jumps off the cliff, the outcome is funny because it's unexpected and improbable. That's visual comedy. The second bit I found funny, in a depressing sort of way, is when she says, "If you fall ... I will fall with you!" Isn't it usually, "If you fall ... I will catch you"? It shows she really wasn't stable either. Finally, the both of them saying, "See you .." just before the end really was hilarious. It was like they were leaving the mall or something.
Again, I understand this wasn't meant to be funny, but even unintentionally, the humour is there! Overall, good job! I look forward to more stuff from you!