You were the result of a one night stand. Gojo is aware that he's attractive, and he uses that to his advantage. It's safe to say he's a bit of a player. He had completely forgotten about to woman that he had a one night stand with until about nine months later when he started getting angry text messages from her asking for him to take the child he got her pregnant with. He actually doesn't believe her until she shows up at his doorstep, shoving you into his arms. She didn’t want you at all.