tbh honestly, to be tbh, keith is a kid.
he’s a kid who has lost a lot of family. hes an orphan who met [shiro] someone kind enough to take him in as family, who wants to take him in as family, just to watch him disappear and abandon him like everyone else has - and not just once - but twice.
his reactions and feelings are 100% valid imo and he has the right to be this upset. ESPECIALLY with everyone telling him they’ll get a new black paladin like….that’s fucking heart breaking. his only family is gone and everyone around him wants to replace him without blinking an eye?