Imagine this. You're Spock. You've tried not to get yourself emotionally involved with your crewmates. It's not going very well. Your doctor goes and contracts a terminal illness and doesn't tell you (but luckily your captain can't go three seconds without breaking Space HIPAA or whatever exists in the future) and then tries to run away and die on an asteroid. You take out the Instrument of Obedience, privately thinking that it would be nice to have some control over this maniac you somehow care about's actions. You spend Surak knows how much time downloading and translating an entire civilization's medical library to cure him. No problem. It was just an incurable disease. You didn't need to sleep this month.
Two episodes later, another alien civilization tries to check said doctor out like he's a library book and then writes "withdrawn" on his forehead and pretends they don't have to give him back. He tells you to leave to save yourself; he'll stay. Did you mention you decoded an entire medical archive like two weeks ago for---fine. You go through unspeakable emotional violations to put him back into circulation on the Enterprise. It's cool. You didn't need your dignity anyway.
Two episodes after that, your illogical, self-sacrificial doctor mutinies and sedates you--the ranking officer in charge--undoing the fact that, again, how many hours did you spend? Curing an incurable illness because you couldn't let him die? Singing like an idiot in front of a bunch of snickering Platonians with laurel leaves on your head and no pants to speak of?--so he can get himself tortured to death on your behalf. You convince an empath to save him. He pushes her away because he "can't destroy life." Your captain is crying. The shiny force field shows everyone that you're having very non-shiny emotions. Do Vulcans even believe in hell
You think you've finally reached some sort of sacrificial detente. It's been a while. Neither of you have died on the other's behalf. You've both had to save your captain a few times, but that's normal. All in a day's work. Then said captain wants all three of you to check out a mysteriously abandoned library of time periods. You should have figured you would wind up in some sort of frozen wasteland with your doctor and no perceivable way to return what you'd borrowed. Well. At least there's the two of you so that you can keep an eye on--
He falls down in the snow. His hands are blue. "Go on without me," he says, dramatically. "Alone, you have a chance."
yeah I'd strangle that fucker against a cave wall too