From "The Best Thing About Marriage is Divorce" by Kurt Caswell

...We Americans are especially hard-lined in our belief that we're a liberated nation when it comes to love and marriage. With Platonic fealty, our mission is to seek and find that one individual God made only for us. He or she is out there somewhere, we believe, and when the moment is right (perhaps when God finds us ready or worthy--is this the one?), a chance meeting will result in a tender courtship, love, marriage, children, and "joy and union without end," as Milton put it. This pious attitude has Americans looking to their marriage partners to fulfill all needs and desires: emotional, spiritual, sexual, intellectual, and financial. Who can live up to that? Furthermore, researchers say, such reliance on our spouses often results in a separation from our communities. Our sphere of friendships atrophies, and soon not only do we look to our spouse for everything, but our spouse is the only one left to look to. No wonder over half of all marriages in the U.S. end in divorce, and paradoxically, the rate is even higher in the Bible Belt.

This quote is a bit out of context, but echoes things brought up in recent conversations with some friends.
For the full essay (which has a bit of a different message than that of just this quote) check out the latest issue (Fall/Winter 2007-2008) of Ninth Letter.