Coud it be the "scripts" are so similar because there are only so many ways one can break this kind of news to another?
The script seems to be worded in such a way that relfects the following: guilt, confusion, wanting to let someone down easy, justification, etc, but the bottom line to what they're saying is, as my wife so bluntly put it: "I don't want to be married to you anymore".
I don't think so, TT, because the "script" is followed -- with only a VERY few variations -- at every step along the way, not just at the "bomb." I have my own theories on this, mostly spiritual in nature, that would be better discussed on another thread, but I think Hoozh's suggestion is a fascinating one: the gubmint oughta do a study!! God knows it could help more people than the myriad of "Dating Habits of Two-Horned Frogs" and such that we fund now!
