Perhaps in the fanfiction, there is some external influence on Ron. Maybe he's been put under a spell or influenced by a dark force that makes him act out of character. Another possibility is that he has a wrong understanding of their relationship. He might think that in a friendship, it's okay to be controlling, especially if he has some traditional views about male - female relationships within the wizarding world.
It could be that Ron has his own insecurities. He might feel inferior to Hermione in terms of intelligence and magical abilities. By trying to control her, he hopes to feel more powerful or important. For example, if Hermione is always getting top grades and solving complex magical problems, Ron might think that by controlling her actions, he can somehow boost his own self - esteem.
In some fanfictions, Ron might be depicted as having a controlling influence over Hermione, but this is not a universal portrayal. Fanfiction is a vast and diverse genre, and different authors may explore different relationship dynamics between the characters.
It could be that Ron is having a bad day or going through some personal issues. And instead of dealing with them in a healthy way, he takes it out on Hermione. For example, if he's feeling insecure about his place in the group, he might lash out at her.
Perhaps in the fanfiction, Ron's jealousy gets the better of him. He might be jealous of Hermione's success or her friendships with other characters like Harry or some of her academic peers. His jealousy could manifest in ways that make Hermione feel suffocated or unappreciated, causing her to end the relationship. Also, Ron may have some habits that Hermione can't tolerate anymore. For example, his slacking off on certain responsibilities or not taking things as seriously as she does.
One reason could be for the sake of creating drama. By showing Ron as controlling, it adds tension to the story. Another might be a misinterpretation of his character traits. If an author emphasizes his protective side too much, it could come across as controlling.
One possible reason could be that in the fanfiction, Bill might be depicted as more mature and worldly compared to Ron. Hermione may be attracted to his experience and the different perspective he can offer.
It could be a way for writers to show their creativity. By taking a well - known relationship and flipping it on its head, they can create unique and unexpected storylines. Maybe they want to explore how Ron would react to Hermione's hatred and how it would change his character development. Also, some fans might have their own personal interpretations of the characters that deviate from the original, leading them to write such fanfiction.
Perhaps Hermione confronts Ron about his lack of commitment to their friendship or to their studies. In the fanfiction, she might be tired of always having to push him to do better and finally snaps at him. For example, she could bring up all the times he's slacked off during group projects or when they were preparing for exams.
It could also be that Dumbledore has some secrets that he's afraid Hermione will uncover if she's left to her own devices. Hermione is known for her inquisitive nature. So, to keep these secrets hidden, he attempts to control her. For instance, if there are some hidden aspects of Hogwarts' history or certain faculty members that he doesn't want exposed, he might use control over Hermione to prevent her from delving too deep.
Another aspect could be Ron's jealousy issues. In the original story, Ron sometimes gets jealous of Hermione's friendship with Harry or her academic achievements. In fanfiction, this jealousy could be exaggerated to a point where Hermione can't tolerate it anymore and thus is written as hating him. For example, if Ron constantly tries to undermine her success out of jealousy, it would be a valid reason for her to develop strong negative feelings towards him.
Well, Hermione has a unique charm. In fanfiction, Bill could be attracted to her because of her strong sense of justice. She is always fighting for what's right, and Bill, who has seen a lot in the wizarding world, might admire that. Also, her loyalty to her friends is something that could draw Bill to her. He might see in her a kindred spirit in terms of being there for those he cares about.