It didn't help that her mother was a "BOLTER", of course, and that her alcoholic father was distant AND remarried.
The "FIRM" did everything possible, to make her 1) feel included 2) protect her 3) help her, long before the public found out about far too much.
Di threw her pregnant self down a huge flight of stairs, when she was carrying William, out of spite.And THAT was just one tint episode early on.
Di and Charles were SO dissimilar, had less than NO common interests, and she was also 1) demanding 2)immature 3) manipulating 4) passive-aggressive from the start.
Ironically, it sounds like Harry married someone just like his mother.