see Koga is a moron for letting Meguro off on her own and bearing the burden by herself, when he SHOULD have been checking in on her and reassuring her often, y'know... as a BOYFRIEND should.... because now she seemingly can't think about how he feels when he DOESN'T tell her... she seemed way too dependent on him, so now she wants to break up so that she doesn't feel guilty about letting him down. at least that's what this chapter SEEMS to be depicting.
tbh this just feels like NTR bait, because by sheer coincidence this is where we're introduced to her ex-bf, and the moment he hangs out with her again, she stops seeing Koga. very sensible, author.