Two are better than one; because it is well worth the effort. For if they fall, the one will lift up their companion: but woe to one that falls alone; for there is no one to help them up. Also, if two sleep together, then they arouse each other: but how can one become aroused all alone? And if one is overwhelmed, two can stand together; a threefold cord is not quickly broken. (Ecclesiastes 4:9-12)
I see many married people take their marriage and their spouse for granted. They have forgotten what it was like to be alone. Every single person I talk with who is crying out for a life partner will tell you loneliness is the hardest part. You will also hear that it seems all the good men or women are married.