things can change
only if I let them
Scenario: You marry a woman, live happily for a few years, but then, due to circumstances out of your control, she undergoes some traumatic event. Her personality changes, as can be expected, but being a good person, you stay with her so that she can have at least one good thing in her life. Yet, this isn't enough, as she starts lashing out at you at every given opportunity, making it impossible to actually be there for her. You try counseling, you try therapy, she is either unaccepting of or unresponsive to it all. There is no longer any reason for you to be with her, as all of your best efforts have failed to remedy the situation, and so you split apart. Would you say that you
let that happen? You assume too much of your own abilities, and not enough of random chance.
not everything can be predicted
yes they can!
I suppose, if we were given an infinite amount of time, resources, and sensory capability, then yes, everything could be predicted down to the atomic level. However, we do not now, nor will we ever, have these things. There are so many things that can change the course of a relationship that we will never have the ability to fully predict, and that is why it's sensible for ETF to be worried about the implications of such a commitment.
Life can be unpredictable, but that doesn't mean that you say "Ah screw it, whatever happens happens" when making a commitment like marriage. 
But...that's my point. I'm saying that by ETF considering divorce and commitment before marriage, this says nothing about the person she'd be marrying. It says that she's being careful and NOT just saying "Ah screw it, whatever happens happens".
