
From all that hint, i can totally say that Sakura's backstory gonna break all of us apart including Boufurin. I think at some point, his parents will come and insult his friends, want him to go back with them for some shitty reason. And that will be the all school and town's turn to protect Sakura... IMAGINE HOW GOOD AND TOUCHING THAT CAN BE

First time I read this scene in novel I was like "WHY DON'T YOU JUST CALL FOR HELP OR GO HOSPITAL INSTEAD OF WASTING TIME" but then I realised. He knows he has a weak heart and poor body condition. He knows that if his fragile heart stops once, he can not survive from a surgery. Seeing your beloved last time kinda dramatic and cliche but... I'd do the same if i were in his shoe.
Also you can't expect someone who is terrified and injured to make the right choices there. At least he called for the ambulance :D
Omg man what is this sudden calm and collect daddy energy??? ٩(๑❛ᴗ❛๑)۶