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Anime and Manga
- In Dragon Ball, most of Goku's friends don't tell him about his were-monkey problem because they were afraid that he'd put two and two together and realize that he was probably the very monster that killed his (adoptive) grandfather. He eventually figures it out when he sees Vegeta transform, but he's too busy trying not to get killed to BSOD over it.
- In Higurashi: When They Cry, Rika not only doesn't tell Akasaka exactly why he'll regret not going back to Tokyo, in the manga, she actually cuts the cord of the telephone lines so he can't call the hospital his pregnant wife is at. It isn't until Ooishi finds him with Rika on a hill that Akasaka finds out his wife is dead. Rika gives this trope as the reason for not telling him, because she knew that he'd fall into such deep despair that he wouldn't be able to help her.
- In Tiger & Bunny, Kotetsu has a problem with disclosing personal issues, even when they have major consequences for others, because he doesn't like worrying people and bothering them with his own problems. This ends up biting him in the ass on a grand scale in the second half of the series.
- In Natsume's Book of Friends, this is the reason Natsume is reluctant to tell the Fujiwaras about his problems with youkai and ayakashi - They'd have to live with the fact that he is attacked by invisible monsters every day, and that there's very little they could do about it.
- In The Irregular at Magic High School, nobody told Miyuki about her duty to kill Tatsuya because she was 13 at the time and might have rejected it outright. Also, because knowing about it gave her more political leverage than anyone in the family was comfortable with.
- In chapter 43 of Paper Luigi X, Knuckles receives a vision from his Master Emerald that Team Mario would be splitting up after their current quest, which would mean that Team Luigi would be splitting up as well. Soon the rest of the team is aware of the fact—except for Malon, who only gets informed of such after the final battle. She doesn't take it well.
- There's a Supernatural alternate-season-four-fanfic where Zachariah edited Dean's memory hard at some point in the process of bringing him back, so while he's still Dean in all kinds of ways he has no particular emotional attachment to, for example, Sam or the Impala, and isn't likely to die for Sam again. Then Zachariah turns up and explains to him that, actually, Dean Winchester broke so badly in Hell that they couldn't bring him back, and he's just someone who was tortured so badly his own identity vanished, and Zachariah just refitted his soul so Sam would have a big brother to keep him stable. Dean eventually buys it, but doesn't tell Sam for exactly this reason.
- In Shaun of the Dead, Shaun's mum doesn't tell him she's a Zombie Infectee because she didn't want him to worry. *sniffle* This isn't so much "you'd be unhappy" as "you'd be even more unhappy," though, under the circumstances.
- In The Dark Knight, Alfred burns a letter from the recently-deceased Rachel, saying that she was going to marry Harvey Dent, in order to keep from further tormenting Bruce/Batman.
- And this is pretty much the justification for not making it public that Harvey Dent went crazy, killed several people and kidnapped Gordon's family, and that the ensuing standoff lead to his death. Of course, fancier words were used.
- In Dragon Bones, Oreg doesn't tell Ward that their only option to prevent the villains from getting their hands on the eponymous dragon bones is to kill Oreg, which will make castle Hurog collapse and bury the bones under it. This is part of his plan, as he knows Ward would never accept the truth if he wasn't told about it by several people. So he waits until he has Axiel right there, a half-dwarf, who knows why, exactly, the dragon bones being stolen by the villain would be terrible. He then casually mentions what the villains are doing at the moment, and what can be done about it. Ward is not amused that he wasn't told earlier.
- In Robin Hobb's Farseer and Tawny Man trilogies, Fitz never lets Burrich know he's still alive because Burrich is married to Fitz's former sweetheart Molly and he wants them to be happy. Burrich finds out about fifteen years later, and is understandably upset, but he dies before Molly finds out, and Molly marries Fitz.
- In Kokoro by Natsume Soseki, Sensei hides the reason for his constant guilt from his wife so her innocence won't be tainted by the world's evils.
- Played with in the Isaac Asimov short story "Liar!", one of several which eventually became the book I, Robot.
- To expand on that, the story focuses on a robot who, through a random fluke, can read peoples minds. The robot promptly begins lying to everyone since it is programmed to not harm humans, which means it can't hurt their feelings by telling them an unpleasant truth i.e. that the person they are in love with doesn't return their affections. In the end, Susan Calvin, having been borderline Mind Raped by the robot into thinking the painful world around her was All Just a Dream, induces a Logic Bomb on the robot that would have made Captain Kirk proud.
- In Harry Potter and the Order of the Phoenix, Dumbledore admits that he made a huge mistake that ultimately cost Sirius his life by not revealing the Awful Truth to Harry in a misguided attempt to keep him happy. Each year he had the chance to tell Harry the reason he and Voldemort's fates were intertwined, and each year he held back because he wanted to spare Harry the burden. Dumbledore bitterly states that he acted exactly the way Voldemort believes everyone who acts on love and compassion does: foolishly.
Live Action TV
- Baywatch episode "Baywatch Down Under". Jake learns that his ex-wife didn't tell him she had become pregnant with his child before divorcing him, because she felt he needed to be free and didn't want him to feel obliged to stay with her.
- In Supernatural, Dean doesn't want Sam to know that he sold his soul to save him because it would make him unhappy. Sam finds out anyway.
- Actually, this is just a thing Dean does - for example, not telling Sam what he did while soulless (again, Sam finds out anyway). He's still doing it by season nine.
- In one episode of Curb Your Enthusiasm, Larry's mother dies while he is shooting a film in New York. No one in his family tells him this because it was actually her dying wish that they not bother him about it. Larry is understandably upset that his mother died, had a funeral, and everyone has moved on- all while he was filming in New York and only just found out about it.
- He calls her out on this when he meets her in the afterlife.
- In the short-lived series The Cape, an astronaut goes on a Shuttle mission as his wife is about to give birth. She dies of complications during the birth, and Mission Control keeps this from the crew until they return to Earth.
- Smallville. Too many times used to count.
- This happens in an episode of Lie to Me: Lightman doesn't tell Torres about her boyfriend being located at the site of an accident because she'll be more useful to everybody if she stays and helps identify the culprit.
- In Season 3 of The Flash: Most of the cast decides not to tell Joe about future events that affect his daughter, Iris.
- Sweeney Todd: The Demon Barber of Fleet Street, so, so much. Without this trope, the musical would have no story. However, it's deconstructed in that Mrs Lovett doesn't refrain from telling Sweeney that his wife Lucy is still alive, but an insane, homeless prostitute because she thinks it will upset him; that's just how she tries to square it when everything hits the fan. In reality it's just as much that she wants him for herself as it is altruistic.
- In Fire Emblem, Lord Uther has actually been beset with crippling illness for most of the game. Oswin is aware of the illness from the beginning, but doesn't tell main character Hector about it under Uther's orders. Uther knew that Hector would have left Eliwood and Lyn's party and would have spent the rest of his life regretting it if he were told.
- In Tales of Symphonia, Colette hides what's happening to her as she's releasing the seals, that she's supposed to die at the end of the Journey of World Regeneration, and that she's being crystallized by a disease at various points in the story, all to avoid her companions (Lloyd in particular) worrying about her. However, keeping all of this hidden ends up coming back to bite her when Reality Ensues. Not telling anyone what's going on doesn't mean it isn't going to happen, and when what Colette is hiding comes to the forefront, the party often has no idea of how to deal with it. Colette ends up making numerous problems worse and nearly dies several times as a result, which Lloyd finally calls her out on late in the game.
- Tifa of Final Fantasy VII avoids telling Cloud about what actually happened at Nibelheim. Considering the likely outcome of that knowledge it's understandable, but it really does cause a mess.
- In Final Fantasy X, Yuna doesn't tell Tidus about her impending death because he would hate it and couldn't do anything to stop it. Also, she understandably didn't want to talk about committing suicide. In the finale, Tidus doesn't tell her that he'll fade away soon for exactly the same reasons.
- The My Little Pony: Friendship Is Magic episode "Green Isn't Your Color" features three instances of this trope at once. On one hand, Rarity is jealous of Fluttershy when she becomes a famous fashion model, but is afraid to tell her because she encouraged Fluttershy to do it in the first place; on the other hand, Fluttershy actually hates being a model, but keeps doing it because she doesn't want to let Rarity down. Twilight, meanwhile, is more than happy to reveal the truth to the two, but both make her promise not to tell the other, and Pinkie Pie convinces her that breaking promises and losing your friends' trust is the fastest way to lose a friend FOREVER.
- The Spongebob Squarepants episode "Roller Cowards" has SpongeBob and Patrick being afraid of going on a new roller-coaster they were hyped up about, but couldn't bear to tell each other to they wouldn't be disappointed in each other.
- The Goof Troop episode "Educating Goofy" has Goofy going back to school to set a good example for Max, but Max thinks he's there to embarrass him and enters in the same spelling bee as him to spite him. Later, when Peg tells him about Goofy's true intentions, Max feels guilty and decides to purposely lose so Goofy can get his diploma. However, P.J. has just told Goofy that Max felt embarrassed because of him and he decides to lose so he wouldn't be humiliated . Hilarity Ensues from there.