Hm I cant remember the part in your first point..but I think the video was a plot device, it didn't necessarily have to be a video it could have been anything, just to push the two of them to a breaking point
As for the ending, she says in the authors note that it was fairytale like ending so I believe its like "they escaped and lived happily ever after" so in a sense we can imagine their lives however we want,(if we weren't getting side stories)
But those are just my thoughts ( ̄∇ ̄")

Tsk I’m so frustrated I have a lot of questions.
1) what’s that 11 karaoke bar or sumn in the lighter
2) did they get to delete the video — what even is the purpose of this subplot?
3) so what happened then after they escaped
I mean there’s more and these should all be part of the main story.