Why is Lu Dongbin not with Fairy Peony?

Why they are not together, I think it is because, first of all, it is the reason of heaven, destiny is difficult, and the other one is the most important reason, which should be personal. A person faces the current situation. , whether he is obsessed with his own happiness in life, or whether he wants to save the world, this is the main point. It is also because he has this broad mind that he can give up his children's personal relationship and give up the Peony Fairy. I think everyone has read "Journey to the East" , after Lu Dongbin was lifted from the blood curse, when he saw Peony again, his eyes were no longer that of love, but a kind of fraternity that transcended the kind of personal love between children, and it was the same look for anyone. It was because he let go, let go of these trivial human loves, and moved towards the road of saving the common people. So this is the reason why they did not and could not be together, because he came to this world with a mission!