Funny you should say "textbook" as that is what a number of my friends who have gotten divorced say about her actions. Nearly all of her friends are now divorced/separated and she certainly has no lack of "what not to do" or "be sure you do" examples to follow.
Me 47 W 44 D16, D13 T 23yrs M 20yrs WAW/MLC + Male EA "BFF from H.S." = Misery