Maybe she has a history of betraying or deceiving others in the story.
Perhaps she has a darker side that is revealed gradually throughout the novel. Maybe she makes choices that go against the protagonist's interests or values. Or maybe she's involved in some shady activities that make it hard to trust her.
It could be due to jealousy. Maybe one twin is more successful or popular, and the other starts to feel envious and that can lead to distrust.
Another thing is to look back at your past experiences together. Sometimes, our current distrust might be influenced by some past events that we misinterpreted. Analyze those events and see if there are different perspectives. For example, if you think she once betrayed you, but it might be a miscommunication at that time.
Well, it could be that the story has too many loose ends or inconsistent details. Maybe the writing style is confusing and makes it hard for readers to have faith in it.
Well, it could be that the story is too far-fetched or has lots of logical holes. Maybe the writing style is poor, making it hard for readers to get engaged and trust the narrative.
It might have inaccurate or misleading information that could lead us astray.
Maybe she has a history of deception or has shown unreliable behavior.
Maybe it has some inaccurate or misleading content that makes it untrustworthy.
It could be that her motives and actions throughout the story are questionable and give us reasons not to trust her. Maybe she keeps secrets or makes choices that seem self-serving.
Maybe he has a history of lying or being unreliable. That could be a reason not to trust him.
Maybe he has a history of lying or his actions don't match his words. That could be why we shouldn't trust him.