What do the book titles of The Twilight Saga mean?

Well...in the book at the very end Bella says that Jacob is her, sun and he shines through the clouds, then Jacob said "I can't shine through an eclipse" (meaning Edward, being her sun and moon), and that is why the book is called eclipse. But during the whole book Bella can't decide between loving, being changed, and marrying Edward, or staying human and loving Jacob so the whole time mostly in the book she's in an eclipse. But Every one know that she is going to choose Edward. Duhhh! wrong Jacob is the best.