The only person you will have to spend all your life together is yourself. So we are better to love ourself before we love somebody else.
But have you heard about parents who don't really love each other but are still together? I think when you grew up you need a Partner. You have a lot of respect for each other, and you have a lot of affection, but after a while you become partner for life. I know some people who got disappointed when they lost the little magical feeling they have in the beginning, but it is normal. We always learn about big love, romantically love, but that's not the reality.