why do married couple divorce?

THIS VIDEO THAT I HAVE MANAGED TO FIND IS FROM YOUTUBE. YIU CAN WATCH THIS VIDEO HERE -------->  http://www.youtube.com/watch?v=HOkvrDI-3UY]

THIS IS A VIDEO ABOUT WHY COUPLES DIVORCE.THIS VIDEO MAY RELATE TO MY COURSEWORK BECAUSE I AM DOING SOMETHING WHICH IS ABOUT DIVORCE.

 this one is a video of why we love and why do we divorce?
you can find this video on this link http://www.youtube.com/watch?v=XIyoUwXFyu4