i guess you could make the point that you may not be as happy as you could be, and you wouldn't know it.
For example, my first long term relationship lasted roughtly a year and a third. After a year i was sure that she could be the right person. Eventually she broke up with me and i was very upset for a long time. Now looking back on it I'm scared that I could have stayed with her and possibly gone on forever...
When it's your first relationship the comfortable feeling and the niceness of having someone there can hide your true feelings.
I never realised that things weren't as good as they could be, and i never realised that she really wasn't the right person for me. And if I could be that blind I think other people can be too. It takes the breakup of a serious relationship for you to learn a lot of things about yourself and about what you need in a relationship.
On the other hand many people stay with their first partner and are really happy. I guess there isn't a correct answer
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