system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Why is Jean Grey so tormented in the movies?

In the movies her phoenix powers give her nightmares and melt walls etc, and are described as wanting to burst out and difficult to control. What is going on with Jean Grey? Is it the size of her powers that are difficult to contain, or is it the nature of the phoenix inside of her to be wild, or is it some sort of possession? Can someone explain the phoenix better...
gpt
It's literally all three of the reasons you mentioned. The Phoenix is an overpowering force always attempting to fully manifest itself in a girl that it's possessed. 

Jean Grey isn't treated so well in the comics, either. Probably worse, actually.