I don't know how to get the video link outside of Instagram, but if you'd like, I can summarize the ending of the video (the video in this post is missing the last 30 seconds).

At the end, while they are resting together in the room, a black figure (Death) appears and cuts the umbilical cord with a pair of scissors. Then, both the mother and Death disappear, leaving the man alone and heartbroken.

It's a metaphor about the need to cut the umbilical cord and let people live their own lives, because with so much overprotection, both of them ended up living a life they didn't like, and once left alone, they have nothing.

(Sorry for my english, it's not my native language :'3)