A trustworthy man usually shows strong, brave, honest, upright, generous, confident, decisive, responsible, gentle, considerate, intelligent, kind, caring and other excellent qualities. Therefore, you only need to believe in a man to get his protection and love, and also to win his respect and appreciation.
Harry Potter is another example. He trusts his friends and mentors, which plays a crucial role in his adventures. His trust helps him overcome many challenges.
One such story is that of Abraham. God asked him to sacrifice his son Isaac, but at the last moment, God provided a ram as a substitute. This showed Abraham's trust in God's plan.
In fanfiction, when Harry doesn't trust Dumbledore, it often leads to a shift in the power balance. Harry might take more matters into his own hands, which could have both positive and negative outcomes. Positively, he could become more self - reliant and develop his own unique way of dealing with threats. Negatively, he could end up putting himself and others in more danger without Dumbledore's wisdom to guide him.
There is a fanfic called 'Sasuke's Unwavering Trust'. In this, Sasuke's trust in Naruto is a central theme that drives the plot forward. It explores their relationship from different angles, especially during battles where they have to rely on each other.
In some fanfictions, there might be a new magical element or prophecy that makes Harry question Hermione's motives. If the prophecy says something about Hermione being involved in a dark plot, even if it's false, Harry may start to have doubts about her.
Maybe he has been burned before by some poorly written or out - of - character fanfics. Some fanfics can deviate a great deal from the original source material, and if Harry is a big fan of the original, this can make him distrustful.
One reason could be jealousy. In some fanfictions, if Harry has become very famous and powerful, he might think the Weasleys have different motives for being around him, like using his fame for their own gain. So he starts to lose trust in them.