Wait, she went two weeks without searching him out or trying to repair things between them? That’s a pretty lengthy amount of time (especially for students).
2 wks was a short time for me when I was in the uni. At some points, I wouldn't even realize that a few months had already passed. Oh, but I suppose time flows differently for people and I'd been pretty busy back then. Maybe the same is true for them?
EDIT: ACK! I just re-read the chapter and it's ripping my heart out. Why on earth did I re-read it T_T oTL
@Kaizeel when they were kids, he gave Umi a candy ring. He said it was all he can get for now or something like that, and he made a promise to her that he'd give her a real ring next time.