A possible storyline could be that Bella discovers a long - lost family and gets involved with them, putting all her energy into getting to know her family members and heritage. Since she's so occupied with this new aspect of her life, Edward becomes an afterthought. Another storyline might be that Bella becomes a strong advocate for a cause, like protecting the environment or helping the less fortunate. Her focus on this cause is so intense that any feelings she might have had for Edward fade away. And perhaps in some fanfiction, Bella gets involved in a time - travel plot where she goes back in time to change certain events, and in this new timeline, she doesn't fall in love with Edward.
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.
Perhaps in the fanfiction, Bella could be in a situation where she tries to expose Edward's abusive behavior to the vampire community. This could lead to a complex web of relationships being affected as the vampires have their own set of rules and ethics regarding such behavior. And she may find some unexpected allies within the vampire world who help her get away from Edward.
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.
Maybe the fanfiction writer wants to explore different character dynamics. They might be trying to break the traditional 'Bella loves Edward' trope and create more complex storylines where Bella has different feelings.
For Edward, there's likely a mix of relief and fear. Relief because he's finally expressing his deep love for Bella, but fear because he's exposing his true feelings and also worried about how this will change things. For Bella, she's probably mostly filled with excitement and a bit of shock. The excitement of this new level of intimacy with Edward, and the shock that this moment she might have dreamed of is actually happening.
Perhaps in the fanfiction, Edward broke a significant promise to Bella. Promises are important in relationships, and if he failed to keep one, it could lead to her not forgiving him. For example, if he promised to always be there for her but then abandoned her in a time of need. Also, his over - protective nature in a wrong way could make Bella feel suffocated and less likely to forgive him.
One reason could be that Jacob realizes they have different life goals. Bella is often so focused on Edward and the vampire world, and Jacob may feel that his werewolf life and values are too different from hers to have a romantic connection. For example, he might want a more traditional werewolf life with his pack, while Bella is constantly drawn to the dangerous and alluring vampire lifestyle.
Another idea is that they get involved in vampire politics more deeply. With their unique family situation and Bella's newfound abilities, they could become important figures in the vampire world. They might work towards changing some of the old vampire laws and traditions, especially those related to hybrids like Renesmee.
One possible storyline could be that Edward becomes overly involved in vampire politics and starts to neglect Bella. He might be constantly away at meetings and not spending time with her. Another could be that he has some unresolved issues from his past that resurface and make him withdrawn from Bella. Maybe he's haunted by memories of his previous life and can't focus on his relationship with her.
One possible storyline could be that Edward leaves due to his fear of endangering Bella and the unborn child. He might think that his vampire nature could bring harm to them, so he decides to distance himself to keep them safe.