I think there might be a societal element to this phenomenon as well.
The media glorifies affairs/divorce, justifies lowering moral standards. We've been bombarded with it since we were kids, and I think we've all become increasingly de-sensitized to those ideas and what they REALLY mean. For some reason, it seemed okay in that movie, I mean, those people really loved each other...it didn't matter that they were married to others.
We're all used to having what we want NOW. If we're not happy, then it's time to start looking elsewhere. Forget patience--those vows we took certainly couldn't include dealing with this unhappiness. What, you mean it isn't my spouse's responsibility to MAKE SURE I'M HAPPY AT ALL TIMES?
I'm sure there have always been these problems, but I do think that part of the reason we're all looking younger is cultural/environmental.
