Ugh. One of my least favourite tropes in fiction is Good Guy Gaslighting.
You know the drill. Heroic Main Character is part of some Underground World (hidden society of vampires/clones/faerie etc) that needs to be kept Top Secret.
Then oblivious Side Character (most often love interest), who is kept in the dark for Their Own Safety starts to catch glimpses of the Secret World. Maybe they see someone survive an attack that should have killed them, maybe they see someone do magic. Whatever it is, they freak out, and go to The Main Character to tell them this crazy thing they’ve seen.
And of course, of course, the Main Character who Knows Best and is doing it For Their Own Safety, assures them that they were seeing things, and totally mistaken, and it’s OK, they’re not crazy, but maybe they just need to take it easy?
And so it continues for however many episodes the writers decide to drag out the ‘let’s watch this character believe they’re going mad as the main character deliberately encourage that perception for their own ends’.
I just hate it so much because it is, at the core of it, gaslighting. It’s deliberate, cruel gaslighting but because it’s done For Their Own Safety by the Heroic Main Character, it’s never condemned and is regularly used as a plot device.