Does divorce occur by saying, "Go back to your family's home, or else you are not my wife and I am not your husband," with no intention of divorce and without having consummated the marriage with the wife?

This phrase is a metonymy uttered by the wife if the husband intends divorce. Divorce does not occur with doubt in it or in what it is conditioned upon. Therefore, as long as the questioner is doubtful about the intention of divorce, his divorce has not occurred by his breaking of the oath.