While I love Mame drawing a line and saying I love you but even I won't wait forever, it still feels like she's unappreciated. While we can feel the sad love for Haru (and even Yume when Souta liked her), when the focus is on Mame it feels like less passionate interest because even now Souta is just beginning to notice her. We see so much of Souta's guilt toward Haru, but not so much of his guilt toward Mame for not taking her seriously for so long, and she's really just too sweet to call him out on him taking her for granted. Even when she leaves, we can see Yu pining after her more than Souta. Then again, as Haru said, he's alway avoided those feelings of Mame's. TBH, super annoying that he's so milktoast and never actually pushes her away or accepts her. It's realistic though, since he's always felt some type of guilt toward Mame whether due to Yume, Haru, or just himself.
While I can see how they have chemistry as kind and familiar friends, I wish there was more intimacy. That really gets lost when even the side characters are progressing further in their relationships. BUT, rather than a love story unfolding I would say this is the journey to the beginning of their actual love story developing as we reach the end of this manga lol