And it's presented to the audience as a good, "romantic" thing, instead of showing her as being, say, an indecisive homewrecker.

PS, the man she's marrying is always an insensitive, unsympathetic jerk so no one can feel bad for him. Making you wonder why she'd marry him.

__________________
"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
Illuminati's Razor-The most complicatedly evil answer is usually the most correct answer. - Fazor
"Every book is a children's book if the kid can read." - Mitch Hedberg
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort