Yeah, that's why I respect the way they did it. For most people their first relationship is just that: their FIRST relationship. Most people will go through several failed relationships before finding someone they can get married to. And even then, that might not last forever. Sometimes people fall out of love, and get divorced. It happens.
I'd like it if more shows represented that, instead of going for the fairy tale of love at first sight, marry the person you met in high school and live happily ever after.