Fact...

They didn't seem all content with the situation in the end. Kitada seemed to only tolerate having Nishimura around for the sake of their happiness, but he didn't seem happy about it. Kitada seemed to just sneak away any given chance, and just generally seemed like he was staying there to only give an occasional push to Nishimura and Sakai. While I do agree that humans aren't necessarily monogamous and I don't see any problem in having polyamorous relationship as long as all the people in the relationship are happy with it, but in this case not all of them are.

The tree way is from Sakai not in a circle. so now you're dictating how a 3 way supposed to be, and love each other. so if they don't love each other they can be together from your simple minded view. love is not a necessity to be in a relationship and to fuck. yes congratulations. now you know people can fuck without idealized feelings. semes have their relation with Sakai not with each other. now you stop spouting your immature bullshit because obviously you're trying to speak about matters where you have absolutely no freaking clue like most of the other kids that bother to comment. this type of relationship and the way the do it don't work with you but do work with other people. relationships will go the way of the people involved want, consent/agree with it, not what others think/do. Kitada knew that Sakai loved Nishimura and Nishimura got to even know about Sakai's sexuality after he got him fuking Kitada. , I really doubt any of them even though about monogamy nor anything related in those situations. you are the one clearly making them in your OWN mind that they wanted a monogamous relation lololololll. And I speak because I did met people in 3-4 way, open relations, etc, etc,from messed up ones to well established ones. not even two of those relationships were equal. And every relation have their own way to deal with it depending the people involved. what can be a hell to you, can be a mesmerizing heaven to another person.

to you they don't see happy. but like I told another person. what is a hell to you is a heaven to another. tons of people get happiness in ways we don't understand. this story shows that pretty much.

so true ╮(￣▽￣)╭
thats why we have this mixed feeling of being happy for them and being dissapointed (〜￣△￣)〜

yep both of them only do it for sakai's sake.....
all the while true i don't think sakai is inconsiderate ...
i think he knows that it is a complicated relationship that's why he feels sorry for almost most of the time....but can't bring himself to choose who he wants to stay..... and he also respect their decision because he is just a human being he can't help wanting to stay by their side and being a little greedy ...
even tho kitada had a choice whether to leave or stay as a friend but he chose to be ones again the SEX friend and in the manga that compromise only happened with the two without sakai's consent ... so i guess all of them are being inconsiderate with one another....
well i do wish for kitada to have a fruitful love and the other two to be happy...
but no one can really say who really is inconsiderate here...
but kitada really is a kind and caring person to put up with it ..... i don't really need to explain kitada cause his personality is the clearest among them all (￣∇￣")
while na-kun (i keep misspelling his freaking name) well he did not know that what he felt for sakai was love and only dated girls because he think he might fall for them (the cute kind) but i think he is the loyal and understanding type because he got so emotional when it comes to sakai and always put him as top priority evn without realizing his own desires.... ╮(￣▽￣)╭

true .... we might agree and disagree with one another's opinion we still can't dictate what really is right or wrong .... morals are kinda the only exception...(￣∇￣")