Yuhi loves her, but perhaps her true love is somewhere else, someone who makes it out to see her other side and embrace her weakness and inward scars, let's see if my guess is even half true.
It's crazy that she rejected Yuhi even though she loves him too. But she didn't want to get in the way of his future. She is young and so is he. She must have considered that.
The flashback with Yuhi is an important scene that future readers of Eternal Melody should remember. It's because of this scene that Sumire hesitated accepting Yuhi's love for her, since she already turned him down.
I wish Sumire to overcome her fears, and if she can not due to all the bad experiences she has had, I want Yuhi's love to overshadow her fears and give her courage again.
I hope for them to meet again, soon