On the other hand, there could be fans who are interested in seeing a different side of the characters. They might see it as an opportunity to explore more complex emotions and relationship dynamics. They could enjoy seeing how Bella copes with being ignored and if she can find a way to get Edward back or move on. Also, some fans might like the drama and angst that this kind of storyline creates, as it adds a new layer of tension to the familiar characters.
Many fans might also be critical. They would expect the fanfiction to stay true to the essence of the characters to some extent. If Edward's behavior seems out of character without proper explanation, they would likely voice their concerns. However, if the story is well - written and the reasons for his ignoring Bella are well - developed, some fans might come around and appreciate the new take on the relationship.
Some fans might be really disappointed. Edward and Bella's relationship is a central part of the Twilight saga, and seeing Edward ignore Bella goes against the idea of their epic love. They would probably feel sad that the loving Edward they know from the original story is acting this way.
Some fans would be outraged. Edward and Bella's relationship is iconic, and any deviation from their loyalty to each other would be unacceptable to them.
There are other fans who are interested in exploring different storylines. They see it as a creative way to expand the Twilight universe. They might enjoy seeing how the characters would react in such a difficult situation, even if it's not in line with the original story.
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 Another could be that he has some unresolved issues from his past that resurface and make him withdrawn from Bella.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.
Some fans might be really shocked and disappointed. Since Edward and Bella are a very iconic couple in the Twilight series, seeing Edward cheat goes against the image many fans have of him. They may feel that it's a betrayal of the original story's concept of their love.
Together, they would likely try to make Renesmee understand that their relationship is special and that her presence is also special. They might give her a hug or some form of affectionate gesture to show that they are a family unit and that her walking in is just a normal part of family life, even if it was an intrusion on their private time.
Edward might be initially shocked. He has always seen Bella as his own and this sudden change could be hard for him to accept. He could become withdrawn and moody, similar to how he was before Bella entered his life.
Edward might be initially shocked and heartbroken. He has been in love with Bella for a long time, so her leaving for Jasper would be a huge blow. He could become withdrawn and moody, brooding over what went wrong.
He could be devastated. Edward is deeply in love with Bella, so he might go into a state of depression. He may isolate himself from his vampire family and friends, constantly replaying in his mind what went wrong in their relationship.
Edward would probably be very confused at first. He would try to understand why Bella would leave him for Rosalie. He might start to analyze all their past interactions, looking for signs that he missed. Eventually, he could become angry, not at Bella directly, but at the situation. He might also feel a sense of betrayal, not just from Bella but also from Rosalie in a way, since Rosalie is 'taking' Bella away from him.
Bella would be heartbroken. She has put so much trust in Edward, and this act of cheating would make her question everything. She might become angry and lash out at both Edward and Tanya. She could also become very sad and isolate herself from others.