Bella could also be determined to move on. She realizes that she has been too dependent on Edward and decides to focus on her own goals. For example, she might go back to school with a newfound enthusiasm for academics, or she could start exploring new hobbies like painting or writing, using these as a way to heal and grow without him.
In some fanfics, Bella reacts with anger. She feels that Edward has let her down or betrayed her in some way. So she throws herself into learning self - defense or other skills to prove that she can be strong on her own. She may also lash out at those who are still associated with Edward, like his family members.
She might become withdrawn and depressed at first. Losing Edward, who has been such a big part of her life, could leave her feeling empty. She may isolate herself from her friends and family, spending a lot of time alone in her room or wandering in the woods where they used to go together.
Often, Bella might become more independent. She could focus on her own growth, like furthering her education or making new human friends. This is a chance for her to explore a life without Edward.
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.
He might become withdrawn at first. Since he's used to being in control and having a certain dynamic in their relationship, Bella's anger could shock him into pulling back. He could go off on his own for a while to think about what he did wrong.
She could be in shock. Bella might initially be too stunned to react immediately. After all, she trusted Edward completely, and this event would shatter that trust. She may withdraw from him emotionally, at least for a while, as she tries to process what happened.
She might initially be very quiet and withdrawn. Just sit there with tears in her eyes, not really saying much as she tries to process her emotions.
Bella may react by trying to understand Edward's reasons. She could be more rational in some fanfictions and instead of just being sad or angry, she starts to investigate. Maybe she discovers that there are forces at work that she can fight against to get Edward back. Or she could decide that she doesn't need him and focus on her own growth and development, becoming a stronger and more independent person without him.
On the other hand, Beca might become very withdrawn. She might isolate herself from others and just focus on her music as a way to cope with the heartbreak. This could be her way of trying to forget about Chloe and the relationship that just ended.
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.
She could be heartbroken. After all, she's pregnant and the person she loves has left her. She might feel abandoned and alone, crying a lot and wondering why Edward would do such a thing.