I need a translation, sorry, its been a long day
Sorry--I didn't explain that very well.
Well I was thinking of it like this:
When GF decided to stop smoking--at a moment when she wasn't craving a cigarette she told me that in the next few day she might want one really, really bad and I wasn't to allow her to have one no matter how bad she wanted one. GF knew she wasn't going to be thinking all that rationally after a few days of going cold turkey--her addiction was going to take over. So she had good reason not to trust herself (at least for a few weeks until the physical withdrawal subsided) to make a rational decision about whether to smoke a cigarette.
Similarly, someone who's going out drinking with friends might ask the designated driver for the night to make sure she doesn't go home with anyone. She might say, "No matter how much I like a guy or how hot he is or how insistent I am, do not let me go home with him. When I'm drunk I want to have sex with every guy in the room and you need to stop me."
It seems like the idea of a no-divorce clause does the same thing. It says that me-now (me at the time of signing) is somehow in a better position to make decisions about marriage than the me-10-years-from-now (the me who might be tempted to get a divorce), and so all decision making power should be taken away from the me-in-10-years. Now that makes sense to me when it comes to drunkeness and addiction; of course I'm going to be a very poor decision maker when I'm drunk or in withdrawal. But I fail to see why I should think that me-now is a better decision maker than me-in-10-years when it comes to marriage/divorce.

10 years of marriage isn't like going through withdrawal or being drunk--it doesn't tend to make people completely irrational and prone to doing really stupid things (at least, I don't think it does!

). In fact, if anything me-in-10-years will probably be a
better decision maker about staying in the marriage than I am now; in 10 years I'll have much more experience and knowledge of the world, plus I'll know all of the details of what is going badly in the marriage which I don't know now.
I have two close cousins (A and B) who are on their 2nd marriages. When they got married around age 22 they seemed to have the belief that there are only a few good reasons for divorce--mostly abuse or infidelity; so had they signed a no-divorce clause they probably wouldn't have included anything but that. But just 5, 6, 7 years later when they were having problems in their marriages that they hadn't even thought of as possibilities. In A's case her husband walked out on her and two children just months after they had purchased a new house which they could barely afford; he said he didn't love A anymore and he wanted a sportscar instead of a mini-van. He'd also agreed to have unprotected sex that could have resulted in pregnancy just days before he left, even though he knew at that point that he was going to leave. A was devastated and for awhile she was sure that he was going to come back (and she had every intention of taking him back); but after a few months he was dating other people and she got used to it and accepted that he'd left her and began making plans for how to move on. Once they began talking about bills and child support and the husband got his own apartment, that was he decided he'd made a mistake and asked her to take him back. She couldn't do it--she said she'd never be able to trust him again. Plus it was only after his new single life went sour and the bills for two different households (she'd been a SAHM) came pouring in that he wanted to come back; what if he was just coming back because it was easier that way?
So A at about 28 years old decided that she wanted a divorce for reasons that at the age of 22 years old she'd never even considered as possibilities. If she had signed a no-divorce clause at age 22 she would have denied her 28 year old self any say whatsoever about getting divorced. My question is, why think that her 22 year old self would be in a better position to make a decision about divorce than her 28 year old self? I mean, the 22 year old self had never even been married--what in the heck could she know about the problems that come up in marriage and how possible it is to overcome them?