I don't think they said that in the actual book, but i remember it in the movie.
In "Twilight," Edward scares off the guys in the parking lot in Chapter 9, "Theory." This scene takes place early in the book when Edward displays his supernatural abilities to protect Bella.
Page 162.
Edward tells Bella that she is his life now in "Twilight" on page 221.
In order for Twilight * Page 274 (Edward says it) * Page 314 (Bella says it) * Page 366 (Edward says it in many words) * Page 418 (Edward and Bella) * Page 456 (Edward says it) * Page 479 (Edward and Bella) * Page 498 (Bella says it)
Edward first tells Bella "I love you" in Twilight by Stephenie Meyer on page 195 of the book.
Edward catches the apple on page 18 of "Twilight."
Chapter 17: The Game. Page 366.
P. 319 of Twilight.
page 306 line 3
Edward talks about the music of the 60s and 70s being inferior compared to classical music on page 328 of the novel "Twilight" by Stephenie Meyer.
They talk in page 43 and Bella sees Edward in the cafeteria on page 22
On page 432 of "Twilight" Bella Swan writes a letter to Edward Cullen.
like 2 times on each page :)
No, Bella does not cheat on Edward in the Twilight series. She remains faithful to him throughout the entire story.