No relationship, however deep and intimate, can ever fully take our loneliness from us. And as long as we go through life expecting this, we are doomed to constant disappointment.  We also do constant violence to our friendships and love relationships because we will demand from our friends something that they cannot give us, namely, total fulfillment.  For example, a goodly number of persons get married precisely because of loneliness. They see their marriage as a panacea for loneliness. After marriage, they discover that they are still lonely, sometimes as lonely as before. Immediately, there is the temptation to think that there is something seriously amiss in the marriage, to foist blame on the marriage partner or on the self, to become disenchanted and seek out new relationships, hoping of course to someday discover the rainbow of total fulfillment.

The Restless Heart: Finding Our Spiritual Home in Times of Loneliness
Ronald Rolheiser