NightRabbit, I can certainly understand that taking time to know someone–to see more than just the positive side that they will try to present to you during the early stages of a relationship–is crucial towards a successful marriage. This is just common sense, really. Certainly, there are examples to the contrary (as FairyChatMom volunteered), but on the whole, understanding the nuances and complexities of an entire person takes an incredibly long time.
That said, I would add that what “an incredibly long time” means varies astronomically from couple to couple. I’ve known couples that were together for decades, while never truly understanding who their partner/spouse was and even what they themselves wanted. In fact, I would venture so far as to say that truly understanding a person in the “I know that we are destined to be soulmates forever” variety is flat out impossible. If you are searching for this all-consuming feeling with your boyfriend, you are never going to find it.
Many others have said so far that people’s interests, desires and personalities are always changing. (Surely you’ve heard of many people going through mid-life crises?) YOU WILL NEVER KNOW whether you are capable of spending your entire life with someone, even if your entire life only has six months left. Spending time getting to know somebody increases the odds. But it will never be an exact science, there will always be margins of error. And I think the idea of assuming that things will just “fall into place”, that one way you’ll realize “This is the one, nothing can break us apart now” just leads to complacency and a slide in maintenance of the relationship, which will undoubtedly lead to problems and makes the failure of the relationship much more likely.
Marriage means something different for everyone. You cannot simply assume that all people get married because they’ve “found the right person”. Many, many people out there are not this vague and imprecise; we think about things, we formulate our own definitions and opinions and add our own nuances of meaning. Surely being on the Dope helps you witness that!
Of course, there are those who don’t think things through. A friend of mine, for example, who is twenty and a college sophomore, got engaged after six months of dating the first guy who treated her decently–not surprisingly, they broke up a few weeks later. I knew it was a mistake, not because of her age or education or even how long she was dating; it’s because she didn’t know what she wanted, and she hadn’t given herself enough opportunity to really understand this guy’s character.
People are never going to be perfect in their search for whatever the hell they’re looking for. But we are going to try, and many of us are going to succeed, and there will be some who completely defy the odds (for example, my hippie-era parents, who were married at eighteen and twenty-one and are still together to this day). And honestly, the couples getting married early probably understand their situation and the nuances of their relationship better than you do. (If they don’t, that’s one huge red flag in their marriage, no matter what the perameters for their relationship are!)