hmm..Issei words and facial expression when he want Nacchan to 'move it'..rub me the wrong way. He could've just say it in a nicer way, like, that's the guy you've been inlove with for 6 years. Not trying to be sensitive snowflake or anything, but that's not very nice and that small interaction could've become worse overtime if Issei can't balance out relationship and work.
it feels like Nacchan is still hung up in the past due to unresolved confrontation. Issei, however, already reached his 'highest' point 'alone' (No Nacchan with him). So seeing Issei like that, ofc Nacchan feels 'inferior' and feels like shit too. He feels lonely because he's not in the same wavelength as Issei, he's not as free as Issei is and there's nothing he is passionate about. Also I’m still not over the fact that Issei pushed him away and they just got over it without a single communication moment????? Like????????? Anyway maybe I’m just sensitive but if that was me.. dude.. I’d be REALLY hurt