Everyone has had a good comment on this. I'm glad that we have learned these lessons this early in our adult life. Just being with that one person cannot complete you.
Thanks to a singles ministry I attended several years ago, I learned that your single life is a time to work on your singluar self. It sounds selfish because it is. I don't have kids or a spouse; why shouldn't I focus on me???
Once you are a complete person through prayer and bible study, your activities, and finding yourself through whatever else, then that special person
who will complement your life will come along. The idea of a relationship or a person completing you seems more like a replacing a missing car door with a piece of sheet metal. That metal may fly off at some point, and you'll be incomplete once again.
I believe that you have to figure out what makes you feel whole through your own efforts, interests, etc. I know someone who now feels incomplete as she's approaching 40 because she focused her 20s and 30s on her husband and kids. She forgot about herself being a part of this world.