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.
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.
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.
Maybe it's because of a past traumatic event related to water that happened to him. Or it could be a supernatural reason specific to the fanfic's alternate universe.
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.
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.
In some fanfictions, Edward might leave Bella for Tanya because of a perceived deeper connection. Maybe Tanya represents a different kind of vampire life that Edward is suddenly drawn to. It could be that he feels a stronger pull towards Tanya's personality or her way of life within the vampire world.
One reason could be that the fanfiction writer is trying to show Bella's growth in a different way. By not having her love Edward, it allows for a different exploration of her character. For example, she could be focused on self - discovery or other aspects of her life rather than the relationship. Also, it might be a reaction to the over - popularity of the Bella - Edward relationship in the original, and the writer wants to break away from it.