Hashem Himself attests that “it is not good for Man to be alone.” It is also not good for Man not to raise a family and enjoy the many far-reaching benefits of married life. But the most striking tragedy of being single, regardless of whether or not the single even realizes it, is being alone – emotionally and spiritually alone. For this there is no adequate replacement.
The proper attitude for a single is a mixed one: to be cheerful and appreciate the positive aspects of his life as it currently is, and to simultaneously feel a deep yearning for his completion as a human being. In Jewish literature a single is only one half a human being, and it does no one any benefit to pretend otherwise. It is a pain we singles must feel and deal with, just as with any other pain that life may bring.