Methinks Yuu doth protest too much.
Like many of you I do really, so very much like this story. Maybe even love this story. It is probably because in many respects I identify with Yuu. (In the rest, I identify with Maki, since I do love reading stories about other couples falling in love).
I'm sad that this story was (possibly) licensed and it will be a loooong time (if ever) that I will get to finish it.
But throwing in my few cents--I don't think it will have a bad ending. In my humblest opinion Yuu may not be in love with Touko (Nanami) in the way that Touko is in love with her, but that is because her feelings take time to grow. I did a quick re-read and if her personality applies to how she loves, she simply takes a long time to make decisions. And the decision to love can't be rushed.
Yuu's sister and friends even say that she is hesitant in joining into groups or activities, but when she does, she goes all out for them. So I think, eventually, Yuu will be head over heels for Touko. Though this may present problems for Touko since she seems to prefer the nonchalant and aloof Yuu as opposed to one who is obsessive about her.
Still, I have hope that the two will eventually come to an understand. For Touko, I think Yuu is her rock and helps keep her steady. Yuu is someone Touko can lean on. And for Yuu, I think Touko is the best choice for someone to fall in love with given her indecisive nature. Touko is patient and doesn't seem to hold back in her feelings. In a way, she's (unconsciously?) giving Yuu plenty of time to learn how to love her.
These two are just so seriously adorable together.