To me it demonstrates how America's media-entertainment industrial complex literally rules the world and our modern culture. That an English Prince, of the worlds oldest surviving monarchy would naturally head off to Hollywood and marry a middling, divorced, semi-attractive B-grade, probably vapid American starlet - over whom everyone coos - proves this point.
You are 100% correct.
He swears he loves her because they have so much in common.
(Right! He doesn't know how he's being manipulated.)