Divorce - why?

This is something that has been on my mind a lot in the last few months.
It has touched me like I never thought it would.

Is it a conscious decision made or it is an unconscious one?
Does it have anything to do with love?
Does time and inattention dull the desire?
Does pride and selfishness distract the heart?

I want to know why.
How it can happen.
It is so shocking, so unexpected, so painful.

I want to protect against it in our marriage.
To never know the sting of separation, the breaking of vows.

In the newsagent today, I saw a card, it said "Congratulations on your divorce, you're free."
It made me incredibly sad.