Charles was not allowed to marry the only true love he'd ever had and forced into the marriage with the psycho, immature, emotionally needy Diana.
Exactly right — on all counts.
"True," perhaps. "First," most definitely not. She is the first to make him put a ring on her finger as payment for giving it up, so that might say something about the depth of his feelings for her...
Not true...CAmilla married another man first...THEN Charles found Diana....who had various mental disturbances pretty much from the get go.