Sparks?!?

Okay so why is Mr. Rochester going to marry someone else if he has obvious affection for Jane? He looks to her for everything which I realize is part of her job but really? There is definitely something more. Jane knows that she has feelings for him but knows that she can't so she is silent but Mr. Rochester doesn't need to be silent. Why doesn't he speak out already? I mean one night before bed he said "Good night, my..." and stopped himself. HE HAS FEELINGS FOR HER!!!! Now on a completely different note what is with Grace Poole? Lighting a bed on fire? There is something wrong with her. Actually she seems completely psycho. Who is she? Maybe I am just missing the point of her but what does she actually do? Does anyone actually know anything about her except for the fact that she is quite strange and LIT A BED ON FIRE IN THE MIDDLE OF THE NIGHT!!! This book is actually starting to get interesting.