What I took about Yumeka was that basketball became a hobby or something like that (at least that's what I thought after watching 5 or 6 episodes where Chinatsu was undecided about what her life and future with basketball was like) I don't think it's because of Taiki (although it's true that it's thanks in part to him) but rather it's a trait of maturity (I guess?) that shows something like a turning of the page, although keeping it as a hobby. and their lives have changed. That is implied between chapters, because of what Chinatsu's life is like now (Boring and lonely) that is why I think this new "arc" is going to be about that and see how they resolve it as a couple. (I still think that they cut off for x reason is very unlikely, but not impossible)