Robert Quillen said "A happy marriage is the union of two good forgivers." There was a time when it was simple. You got married, had kids, worked the land, and stayed married whether you could stand each other or not. The concept of a happy marriage was no more relevant than the idea of "a pretty tractor."

That has changed over time as marriage has become more independent," says Steven Nock, a professor of sociology who studies marriage at the University of Virginia and author of Marriage in Men's Lives. "Couples don't need each other for quite as many things as they once did. If you're running a farm with someone, it doesn't matter if you're pissed at her or not. You need her labor as much as she needs yours. The couple is more or less equally dependent on each other.

But there are exceptions. In some religion marriage is not equal or dependent on each other. In Tibbat there are tribes where women works in the field and husband do household works.
Its really a hardship to maintain and support the family financially all alone. You wont get time for yourself. You have to give your all to the family.

A non Muslim women is more open minded,obligate to work outside and take responsibility of maintenance and support the family equally. Non Muslim women go outside on the market,can take kids out,can study. Comparing to other religion a Muslim women get more advantage then a non Muslim wife.

All those words state that there is more chances to lead a happy married life with a non Muslim women then a Muslim women. Cause happy married life define as equality in every way, could be more or less. But getting married with a Muslim women its one sided responsibility which is really hard to maintain all alone.

So here we see how on the other side marriage with a non Muslim girl is less burden and have more chances to work it better and lead a happy Marriage life by depending on each