In fanfiction, it could be that Edward's possessive behavior scares Bella. He can be overly protective and controlling at times. For example, he might try to limit Bella's interactions with others, which can make her feel trapped and scared.
Well, in some fanfictions, Bella might be scared of Edward because of his vampiric nature. His superhuman strength and speed could be intimidating. Also, the unpredictability of his actions as a vampire who is constantly fighting his bloodlust could make Bella feel scared.
There could be a backstory created in the fanfiction where Edward has a dark past or has been involved in some dangerous situations. Bella, being a human, might be scared of getting caught up in that or of the potential danger that Edward's past could bring to her.
One common scenario is when Edward loses control. Maybe he gets too close to Bella when he's thirsty for blood, and she can see the struggle in his eyes. This nearness and the thought of him potentially harming her can be terrifying for her.
In some fanfiction, Bella might be afraid of Edward because of his vampire nature. His superhuman strength, speed, and the fact that he could potentially lose control and harm her can be a source of fear. For example, in certain stories, Edward's struggle with his bloodlust is emphasized more, making Bella constantly on edge around him.
Maybe she has read too much of it and found the plots repetitive. For example, many fanfictions might follow the same pattern of their relationship drama.
In some fanfiction, Edward might be mean to Bella to create drama. Writers may use this as a plot device to add tension to their relationship. For example, it could be due to some misunderstanding or an external threat that makes Edward act out of character and be mean.
Perhaps there's a conflict in their values. Bella might want to pursue something that Edward thinks is wrong or too risky. For instance, she wants to explore a certain vampire territory that is known to be very dangerous. Edward shouts to try and dissuade her from such a dangerous idea.
It could be that there are external forces at play. Maybe there are other characters or some kind of dark secret in the fanfiction lore that forces Edward to leave Bella while she's pregnant. For example, there could be a threat from a rival group that says they'll harm Bella and the baby if Edward stays, and he thinks leaving will draw the danger away from them.
It could be that she simply wants to keep her real relationship with Edward private. Fanfictions might make her feel like her relationship is being overly exposed or misrepresented. For example, some fanfictions might add in elements that she finds uncomfortable or not true to their actual connection.
The popularity also stems from the fact that it allows fans to delve deeper into the personalities of Edward and Bella. His dominance can bring out different aspects of Bella's character, like her resilience and her ability to stand up to him, which makes for interesting storytelling.
Well, it's popular because fans are really drawn to the intense relationship between Edward and Bella in the original 'Twilight' series. Fanfiction that focuses on Edward's obsession just takes that aspect and magnifies it. It gives readers more of what they love about the couple.
Another reason could be the influence of other characters. There might be a new character in the fanfiction who convinces Bella that Edward is not who she thought he was. This new character could plant seeds of doubt in Bella's mind about Edward's intentions and actions, ultimately resulting in her hatred.