personally i don't vibe with the idea that mahiru's arc is "you need to move on! find someone who actually loves you back girl!" but rather that the culmination of the revue of jealousy reveals that karen DID love mahiru all along. it's just that ...
the way karen chose to express it just wasn't the same kind of thing that mahiru thought to look for because she only yearned for intimacy rather than someone loving her for her personality and talent - something that her low self esteem prevented her from believing
karen's heart is big enough for both hikari and mahiru but the way she expresses it and the way those bonds developed over time was decidedly different. hikari and mahiru were never interchangeable to her and she appreciates both of them in different ways
mahiru's path to fulfillment never was about finding the perfect other half. it was just about loving herself first
also stan karehikamahi/karemahihika/mahikarehika/mahihikakare/hikakaremahi/hikamahikare