
Found where it is, and what it actually is.
Tis quite safe for thy heart, but if you want a brief info:
Spoiler to those that haven't read up 'till Chapter 2 of Vol 8 to the latest.
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What he meant there was their promise of having no secrets between them. Nemu knows Maya would spend most of his time with Ruka now with his new career. And he sees Maya enjoying it, therefore leading him to think that Maya might one day think Nemu is boring and leave him behind to go on with Ruka. Ruka's scene with Nemu just added more to his anxiety and insecurity. Thus leading to the events of the latest chapter.
(I kinda understand Nemu coz I went through this phase before, 'till I got used to the idea that people will always leave me at some point).
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YALL GONNA THUMBS DOWN THIS IF YOU GOT SPOILED BUT I'VE CLEARLY STATED THAT IT's A SPOILER SO READ AT YOUR OWN RISK
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GOD I've read the raws of this and the very last PANEL GOT ME ON EDGE
Well Nemu will say that "I couldn't have ever known that this promise will what broke me the most" or somewhere along those lines klsajdlsada THAT WHY I AM NOT READIN THIS TILL I KNOW WHAT NEMU MEANT BY THAT