Beside the rather nebulous feeling of love, which from talking to long time married couples is not always there. I believe that singles should think of marriage because that's how God designed us.
Gen. 2:18 And the Lord God said, "It is not good that man should be alone; I will make him a helper comparable to him."
From the commentary:
2:18 A helper indicates that Adam's strength for all he was called to be and do was inadequeate in itself. Comparable to him denotes complementarity. The needed help is for daily work, procreation, and mutual support through companionship.
Gen. 2:24 Therefore a man shall leave his father and mother and be joined to his wife, and they shall become one flesh.
From the commentary:
2:24 Leave connotes a priority change on the part of the husband. Be joined has the idea of both passion and permanence. One flesh carries a number of implications, including sexual union, child conception, spiritual and emotional intimacy, and showing each other the same respect shown other close kin, such as one's parents and simblings. This is enhanced in the NT where it is clear that Christian mates are also each other's brother and sister.
From my thoughts:
It's interesting to me that after five days of creation "God saw that it was good" Gen. 1:21b, but after creating man "It is not good that man should be alone". It's interesting that after creating man He said that is was "not good", but after creating woman as man's partner the Word says "Then God saw everything that He had made, and indeed it was very good." Gen 1:31a
It was good before man was made, not good after man was made and very good after woman was made. I don't think that we were made to be single, but that we are made for companionship.
Two are better than one,
Because they have a good reward for their labor.
For if they fall, one will lift up his companion.
But woe to him who is alone when he falls.
For he has no one to help him up.
Again, if two lie down together, they will keep warm;
But how can one be warm alone?
Though one may be overpowered by another, two can withstand him.
And a threefold cord is not quickly broken.