You know, as much as I love happy endings, I like cathartic endings way more. If there's a villain, especially one that has no reasonable justification or isn't sympathetic/relatable, I want to see them suffer. What I would have done for the ending is have the vice-president get over her feelings and distance herself from the class president, leaving the latter with no friends, no support, completely abandoned and alone like she deserves. Because how many other girls did she hurt like the MC? She didn't earn the ending she got.
Looking at the plot as a whole, I get the impression that the artist began wanting to make a light-hearted generic rom-com, then said "You know what? This just sucks. How about I change this to a story about how actions have consequences?" (When will you learn?!) And they got really gung-ho about that, until they heard everything was getting axed (per what Arckuno said). Then they threw up their hands and said "There's no way I can properly depict the emotional weight of this situation in the space I have left, so I'm gonna gloss over it all and punch out early."
So it goes, I guess.