I watched the Movies "Rose Red", "The Diary of Ellen Rimbauer" and I read the Diary book all at about the same time to keep it all fresh in my mind.
As you know, movies never tell all the details of a book and oftentimes the writers mess around with plots and all to keep the movies at a certain length or to just try to get the points across and go from there.
I tend to stick with the story as it is in the book version because that is where you get the details and how the writer originally intended it, so according to the Diary, Ellen was in love with John at first and wanted their life together until they took their trip around the world and Ellen found out how John had a strong sexual desire for other women, and in turn this caused her to get some sort of sexually transmitted disease which she held against him and had caused her problems in years to come.
When she returns to the house, she finds solace there and she switches her love to the love of the house. She does realize she has sexual desires for Sukeena and even acts on them because she doesn't get the love she needs from John.
The House becomes jealous over time, at first taking away those that cause hurt to Ellen-like the affairs John had, but then as the House loves Ellen, it gets jealous of her as well and takes those she loves, even Sukeena in the later years which the movie never covers, then eventually herself.
I think the building of the house was like attention being given to the house and if she stopped, the house felt abandoned.
A few years off, but in case anyone stumbles upon the series and this movie like I did.. Stephen King's Rose Red came before the book. The book was designed as a companion piece for King's mini series when it proved to be very popular. It wasn't even written by King, it was someone else entirely.
So in any instances there's a discrepancy between King's Rose Red and The Diary, I say Rose Red wins over the book or later produced film.