It is idealistic in the way that in the western judeo-christian culture we still have the romantic image of finding someone special, everything clicking and being perfect. It is realistic to say that it's likely that a couple that has split up once will split up again, but look at the divorce rates. It's also realistic to say that a couple that hasn't split up will do so rathar than die together. I have seen several couples split up and get it going again and some of them are happy, some are just content. But so are other couples. My best friend met her bf in high school so after 5 years or so she wanted to go out to the World and explore. After an year, they came back together. After several years of moving together they married each other three years ago and are sickeningly happy nowadays.
