marriage is not a bed of roses. love in the 'rose tinted' sense with its romatic highs lasts for a few years and then you have to think about living with that one person with all their flaws for the rest of your life - it is difficult, to say the least. And this will arise in any marriage - there is no guarantee that if you divorce, the next marriage will work.
Divorce might be an easy option, but it is a traumatic, emotional wrenching experience for both parties. It leaves one scarred and scared. And in fact it might be even more difficult to adjust into a second/third marriage becos one's confidence has been affected. Children bring added complications and responsibilities.
People should think carefully before commiting and go into marriage with their eyes open. The aim should be to try to make the relationship work as long as possible. Unless of course things are completely unbearable between the couple.
