as my own experience, i'd chose to tell her,
cuz i'm the kind of person who cannot hide some feelings of anything,
after this,
we'd been together for a while,
but now it's gone cuz of her family, sigh.
is it really hard to keep a long relationship with a teacher?
I think it's a dangerous game, confessing your feelings to your teacher/professor. I tought English when I was in Taiwan a few years ago and speaking from personal point of view and experience, this kind of student-teacher relationship rarely happen and seldom work out. But to be honest with you, I also had a crush on my painting teacher when I was in collage but didn't say anything back then and still wouldn't say anything if I do see her now.