Genesis 2:18

Here we have, I. An instance of the Creator's care of man and his fatherly concern for his comfort, Gen 2:18. Though God had let him know that he was a subject, by giving him a command, (Gen 2:16, Gen 2:17), yet here he lets him know also, for his encouragement in his obedience, that he was a friend, and a favourite, and one whose satisfaction he was tender of. Observe, 1. How God graciously pitied his solitude: It is not good that man, this man, should be alone. Though there was an upper world of angels and a lower world of brutes, and he between them, yet there being none of the same nature and rank of beings with himself, none that he could converse familiarly with, he might be truly said to be alone. Now he that made him knew both him and what was good for him, better than he did himself, and he said, "It is not good that he should continue thus alone." (1.) It is not for his comfort; for man is a sociable creature. It is a pleasure to him to exchange knowledge and affection with those of his own kind, to inform and to be informed, to love and to be beloved. What God here says of the first man Solomon says of all men (Ecc 4:9, etc.), that two are better than one, and woe to him that is alone.

— Matthew Henry's Concise Commentary (public domain)

THE MAKING OF WOMAN, AND INSTITUTION OF MARRIAGE. (Gen 2:18-25) it is not good for the man to be alone--In the midst of plenty and delights, he was conscious of feelings he could not gratify. To make him sensible of his wants,

— Jamieson-Fausset-Brown Commentary (public domain)