It could be that Bella has a love interest that Lauren also fancies. In fanfiction, love triangles are common. If the object of affection shows more interest in Bella, it would make Lauren jealous. For example, if there's a guy both of them like, and he always chooses Bella over Lauren.
Often, it starts with small incidents. For instance, Bella might get praised in front of Lauren for something she did. This makes Lauren feel inadequate. Then, as the story progresses, more and more situations arise where Bella is in the spotlight and Lauren is left out. Like at a big event in the fanfiction, Bella is the center of attention while Lauren is just a bystander.
One possible reason could be Fleur's unique charm. She is part - Veela, which gives her an alluring quality that might make Harry feel insecure. Another reason might be her skills. If in the fanfiction she is shown to be extremely talented in magic, especially in areas where Harry struggles, it could trigger his jealousy.
One possible reason could be that Luke has certain skills or abilities that Percy admires and feels inferior about. Maybe Luke is better at combat or has more knowledge in a particular area, making Percy jealous.
In the 'Judy Gets Jealous of Nick Fanfiction', Judy might be jealous because the fanfiction could be highlighting Nick's charm and charisma in a way that overshadows her. Fanfiction often exaggerates certain traits of characters. If Nick is shown as being the center of attention all the time in the fanfiction, Judy, who is used to being a strong and important character herself, may feel envious. She might also be jealous if the fanfiction creates a special bond between Nick and another character that she feels should be with her instead.
One possible reason could be Percy's success and popularity. In the fanfiction, Percy might be achieving great things, getting recognition, and Luke, feeling overshadowed, becomes jealous. For example, if Percy is constantly saving the day and being praised while Luke is struggling in the background, that would breed jealousy.
Perhaps in the fanfiction, Judy starts to spend more time with a new character. Nick, who has a deep bond with Judy, sees this new relationship as a threat to their friendship or partnership, and jealousy creeps in. For example, if Judy and the new character are working on a special project together that Nick isn't part of, it could trigger his jealousy.
One common theme is rivalry. Since in the original context they might have some sort of competitive relationship, this is often explored in fanfics. For example, they might compete for the attention of a certain character.
Without more information, it's impossible to say who Lauren is. She could be an ordinary girl, a character in a made - up story, or someone known within a particular group.
One common theme could be Bella's self - discovery. After being cheated on, she may start to explore her own identity outside of her relationship with Edward. Another theme could be friendship. Her friends might play a bigger role in helping her through the tough time.
Yes, there might be some. Some fanfictions like to take a different turn and make the characters grow from such a difficult situation and end up in a positive way, perhaps with Bella finding someone better and Edward realizing his mistake.