@HeadInTheCloud,
Jing has effectively "killed" himself and made XY his "raison d'etre", this was something that appealed to XY, but once XY has healed this will feel suffocating.
i found both CX and Jing just obsessed with XY.
CX is stronger than Jing. He still had a whole world to rule and power is his beloved partner. At the end when XY disappeared from his life forever, CX probably still survived.
Jing would be XY’s housekeeper assistant at most. they had nothing in common. Maybe XY would have more fun with Left Ear and Miao Fu.
About Jing’s lifespan:
the evil 8 tailed Fox had significant degradation in spiritual power due to 1 tail loss. Thus he had wanted to eat XY (dissolved her spiritual power into her blood so that he could take full potential). Jing lost more than 70% of this power.
i remember after the robbery, XY met Jing and he had suffered sickness (over some years) at that time he was predicted of only 100 year living ahead if his sickness was not cured.
a healthy deity such as Yellow emperor could live for 5000 years or more. jing could not surpass 1500 years (i guess).