[in a situation like this, it's easy for makoto to separate himself from the equation. no matter who rin is to him, no matter what his relationship status with rin is, the question and the obvious conflict sousuke is going through--is about sousuke and rin.]

[makoto is, in a way, intruding.]

[which is why he stands awkwardly near a locker, not quite leaning against it, arms crossed in uncertainty.]

--I don't.

[which is why his words, though perhaps contradictory to what makoto has with rin, are genuinely sincere. it doesn't cross his mind that perhaps he should be angry at the insinuation, but truth holds on to the fact that whatever rin and sousuke have gone through it is completely different to what makoto knows; to what makoto has with haru, his best friend--to rin, his boyfriend.]

I can try to understand it if I look at what I have with Haru to what you have with Rin, but it isn't the same. [there are gaps in what makoto knows. he speaks softly, not raising his voice more than necessary, because this isn't about what makoto can put together--but about what sousuke can put into words.] You're... You're part of Rin's family.

[(and the compare and contrast doesn't become about rin and sousuke vs rin and makoto, but rather to what they have for best friends.)]