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"Couldn't one be a perfectly sound person who leads a far more purposeful life once engaged in a harmonious symbiosis with another human being? I certainly think so. Moreover, why do we have to be 'perfectly sound' before we can meet someone? Why can't we be desperately alone and unhappy and become much more balanced or healthy after getting involved with someone?"
Because one and one is two, that's why. Because your stability, confidence, and purpose should not rest with another human being. You can certainly be changed by a partner, but co-dependence is not romantic; it robs you of your adult status.
Geez. You needed to be told this?