
Originally Posted by
The Man
I don't really see much that appears to be a consciously thought out plan to torture Cloud, apart from Jenova's decision to assume Sephiroth's appearance. Then again, my memory of the last third or so of the game is rather hazy.
Beginning at the Temple of the Ancients, Cloud's mind is entered and subverted upon occasion, even reducing him to babbling about getting the Black Materia and calling Meteor. Also, after he's forced to hand the Black Materia over, he's then forced to pound Aerith to a pulp and he has to be stopped by the other party members.
Next, he's nearly forced to crush Aerith beneath the Buster Sword, and when he fights back, she's still killed right in front of him with there having been nothing he could do to stop it. He's then told that he's a puppet.
Next up, he's again told that he's a puppet, but this time he's led to also believe that he's not even a real person, but just a bit of JENOVA's Cells that had been infused with Mako and had taken on the form of an individual named "Cloud" based on someone from Tifa's memory. On top of that, he's told that he wasn't even a successful product of what Hojo was trying to accomplish with him.
He was lied to a lot, both by himself and Sephiroth, and he believed the lies. His mind is battered so greatly that he willingly hands over the Black Materia because he thinks it was his only purpose.