Chores. Yes. Chores.

Most marriages break down over arguments about who does mundane household chores or pays the bills-- and not because of infidelity.

According to an analysis of divorce cases by a law firm, seven in ten marriages fall apart because couples fail to reach an agreement on decisions relating to the home, such as how monthly finances are arranged, where couples live or how household responsibilities are carved up.

Only one in five marriages ends because of infidelity, the law firm said.

TIP:   Couples who treat marriage as a "business merger" and talk about domestic issues are more likely to stay together in the long term.

Of the seven in ten marriages that fail because people can't agree on domestic issues, the most common cause is lack of agreement over finances.

One in eight of these marriages disintegrate because couples are unable to agree on where to settle down.

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