The Torah says that G-d created "them":
וַיִּבְרָא אֱלֹהִים אֶת־הָאָדָם ... זָכָר וּנְקֵבָה בָּרָא אֹתָם׃
And God created man ... male and female He created them.
Later He blesses them:
וַיְבָרֶךְ אֹתָם אֱלֹהִים וַיֹּאמֶר לָהֶם אֱלֹהִים פְּרוּ וּרְבוּ ...׃
God blessed them and God said to them, “Be fertile and increase, f...”
After G-d (re-)creates Adam He commands him in single:
וַיְצַו ה"א עַל־הָאָדָם לֵאמֹר מִכֹּל עֵץ־הַגָּן אָכֹל תֹּאכֵל׃
And the LORD God commanded the man, saying, “Of every tree of the garden you are free to eat;
What happened to "them"?