reason is quite clear .while loving, lovers exhibit their duplicate character and after marriage their genuine character comes out and problems starts and lead to divorce ......so try to be genuine and try to keep ur personality.

Marriage fails because both man/woman aren't yet ready enough to face the marriage life..

I think KDKD has it right here. Marriage is a relationship that requires some serious interpersonal skills that a lot of people have not learned so the odds at failure are very high. If you don't know how to be a good house mate, manage money, negotiate out conflict, stand on your own two feet in the world, parent and so forth you surely are not going to be able to do that in co-operation and affection for another.

I think a lot of times people have different visions of what marriage is suppose to be. I think a lot of times people think everything will be perfect and once they get married...it is everything but perfect.
Sometimes the person you marry change into a complete different person and that leaves you wondering what you ever liked about that person.
It is hard enough to make a marriage work when you are truly in love with someone and then when your partner does not show the true person, it is impossible for a marriage to last.