Which is making Leareth feel several things, layered together messily, and all of it is nearly impossible to put into words. It feels wrong, jarringly so, that Maitimo should have been required to do that. Even if there's a very valid strategic argument for it. Even if - Leareth has made that same trade, arguably, and he's not even sure which selfish needs he traded away, because so much of it was such a very, very long time ago.
...Maybe it's the framing around 'selfishness' that bothers him. He can tell that Maitimo thinks he - doesn't deserve this thing that's so precious to him, thinks he's making a morally wrong choice by wanting it, and – no, just no, that bounces off every part of how Leareth things about existing in a broken world and charting a set of actions that will someday make it less broken. It feels like it twists things, makes it impossible to coolly look at the tactical tradeoffs, if - being a human being who needs certain things to be happy is called 'selfishness' and selfishness is labelled bad.
Leareth wants a world to exist someday where everyone has room to be selfish, to seize and drink in all of the things that they, personally, want and need to flourish - he wants that the same way he wants food when he's hungry, it's not a different thing. People seeing morality as a different thing has always bothered him.
Sometimes a person might have only enough coin to buy a fine garment or pay admission for a theatre production, not both, and have to choose what they want more. Or - maybe a better example is scrimping and saving their coin in the here-and-now, not buying any fine clothes or seeing any plays at all, to afford to give their children a better future. And Leareth makes that tradeoff all the time, the future is a bigger number and so it so often wins, and – sure, he's made a lot of sacrifices, but it's not because he doesn't deserve the things he sacrificed, that's - fake, backward, it's the wrong framing. And some things he wasn't willing to give up, because they would have - hollowed him out, left him without enough of himself to keep going, and it would have been a bad trade.
Leareth doesn't know if it's actually a bad trade that Maitimo's been making. All he knows is that he has strong feelings on the matter, apparently.