I alr posted some months ago and someone helped me but I turns out it wasn't it.
there's this couple dating in high school and they're like YouTubers and post videos togheter, idk why but they break up and he has a mean girl by his side and the FL is so sad, then she meets this boy and he was chubby (it has to do with the plot) her and her friends help him lose weight and she becomes super cute. it's a soft artstyle an i saw it like 3 years ago??? so it might be slightly old maybe published 4 or 6 years ago
IT'S BEEN A LONG JOURNEY BUT WE FINALLY MADE IT