It was not good for Adam to be alone; in God’s image, we’re social beings. God’s plan was to make a suitable helper/companion comparable/equal to Adam. In Adam’s leadership required suitable help. Adam was the most brilliant man who ever lived; the first and greatest of all biologists and botanists, naming all creatures. Adam saw the animals came in pairs but he had no mate.
This is the first “surgery” recorded in history. Adam was freed from the heartache of dating; in many ways God brings us brides. God used Adam’s own body to create Eve to forever remind him of their essential oneness.
Much as there were differences appearance and role, both were of the same substance. Adam recognized that Eve was both like him (bone of my bones and flesh of my flesh) and not like him (woman…taken out of man).