Their contrasting worldviews hit so hard. Haru, it's not like she doesn't care for those memories, yet they're the one holding her back from moving on from this gnawing longing. It hurts, and she saw it as logical to just rip off the bandaid, so to speak. Whereas Midori, memories are all she has. Her present is just going through the motions, and her future isn't something she looks forward to. Her personhood is tangled with the past, and she derives... not exactly joy, but contentment? I don't know, but memories of Tsugumi are her treasure, and to let them go would mean her death as a person. Man ts has me gentle sobbing