How do you know when you've met "the one"? Is it something you feel? If so, what exactly is that feeling?

I know this might be extremely premature for me to even be thinking these sorts of things right now, but the reason why I ask is because I'm genuinely curious about marriage and the feelings and reasons a couple has for entering into one. I asked my mother why she married my father and she simply replied "I don't know, it was a long time ago". They've been happily married for 38 years now, so I guess she had a point. She also told me a healthy, loving relationship shouldn't be too hard.

I don't know. I'm just very curious about these sorts of things.