I personally believe that one should not find a partner who completes him/her, but a partner who complements him/her.

The reason behind is that when the one who completes you leaves, you'd be left with a gaping wound where it was once filled by the partner who completed you. But when the one who complements you leaves, fond memories are left behind and can be kept for life.

I have already found someone who complements me perfectly. =)