And you are the that god. You greatly impacted to fufill this prophecy by bringing the mortal from the future so those lines were directed to you. She was never meant to be your consort Geb, but to forever remain your slave".
"What?!" Geb immediately wished he could un hear what he heard. "What do you mean my slave?"
"You were never meant to be with her. She was never even meant to be with anyone, for her only purpose was to fufill the prophecy and become a slave to you. The more you see her as your consort is the higher she will attain self destruct because she is not fufilling it as it is supposed be therefore, the repercussions will fall on her greatly. So the earlier you start seeing her that way, the longer she will need to live, just to serve you.
Geb fell on knees immediately with his head bowed to the floor as he let out a loud cry. "Aaaaaaah" as he tried to squeeze his skull. "Why is this even happening?!"