Well, it could be many reasons. Maybe there was a misunderstanding. Some dark magic might have been used to make his friends think he did something bad. Or perhaps a powerful enemy framed him by planting false evidence. It's hard to say exactly without more context from the fanfiction.
They're popular because it's a twist on the normal Harry Potter story. People like seeing the hero in a different situation, like being betrayed. It adds drama.
Well, in 'harry betrayed by the light fanfiction', it could be that the so - called good guys, who are associated with the light, have their own agendas. Maybe they sacrifice Harry's well - being or safety for the greater good as they perceive it. For example, they might make decisions without his consent that put him in danger, making Harry feel betrayed. It could also be about secrets being kept from him that, when revealed, make him feel like he can't trust those he thought were on his side.
In fanfiction, the 'betrayal by friends' trope often serves to create drama and character development. For Harry, it could be a shattering experience. However, it also opens the door for new alliances, like with Draco. Draco, who might have his own complex reasons, could see this as an opportunity to show a different side of himself to Harry. It could be a journey of redemption for Draco and a path of self - discovery for Harry.
It's difficult to say for certain if there are popular 'harry betrayed fanfiction' stories. Some fanfictions gain popularity based on how well - written and unique their concepts are. Since the idea of Harry betraying someone or something is a departure from the traditional Harry Potter narrative, it might not be as mainstream. But within the fanfiction community, which is full of diverse and creative interpretations, there could very well be some stories that have a following, though they may not be widely known outside of that specific community.
It could imply that in some fan - created stories about Harry (presumably Harry Potter), the character of Harry has been depicted as betraying someone or something. Maybe he betrays his friends' trust, or goes against the values he's supposed to uphold in the fanfiction world.
In some fanfictions, Dumbledore might be portrayed as betraying Harry by withholding crucial information. For example, if he knew more about Harry's fate or the true nature of the threats he faced but didn't share it all. This could make Harry feel betrayed as he was left in the dark and had to face greater danger without full knowledge.
In this fanfiction, the betrayal might also stem from jealousy. Harry is often in the spotlight, and the Weasleys, who have always been a big family but not always in the center of attention, could let envy get the better of them. This could lead to actions that Harry perceives as betrayal, like spreading rumors or withholding support when he needs it most.
One possible scenario for Harry betraying the Wesleys could be related to secrets. If Harry discovered some dark secret about the Wesleys and exposed it, even if it was for what he thought was the right reason, they might see it as a betrayal. For example, if there was a family secret that could endanger the wizarding world, and Harry made it public without their consent.