I don't think people are really getting the story. If you read it, it said that the story actually ended when they proposed or something. After that, it's all side stories into their lives as husband and wife (of sorts). So it wasn't a fast ending, they were just random stories to help show what happened to all of the other characters, not exactly a flowing story line anymore
I don't like that the main ml butted in on the other prince's confession. It was the one chance for the story to show the main character's loyalty and give her some agency in her own life instead of just being blatantly nice, but instead her fiance just has to butt in and get rid of all of her agency.