Can we ever go back?

I read something really logical from someone's blog. What she has written is too crude for me to put it here. So I will re-write it.

When you have sex, you can't go back just kissing
When you have kissed, you can'g go back to just holding hands
When you have held hands, you can't go back to just being friend

So when you divorced each other, can you go back to be friend?
The answer is of course NOT.