When you buy a $600K ring, you're not really that confident in the relationship. When you see women with these massive diamonds, that often means that either hubby doesn't trust her, or he majorly screwed up and had to pay her to stay.
Real relationships find more meaningful things to do with that much money.
Or they are really loaded. This is the thing that always get me. Middle class people always expect the same economic standards that apply to them do to people that make 1000 times their income. Scandrick makes more in one year than the average American makes in their lifetime ie ~50 years of work.
If you are only making 6 figures then yeah the things you are saying are possible explanations. Not the only ones but certainly plausible. In that case, you are likely having to borrow heavily to buy it. Scandrick just wrote a check.
The problem that I see is that Scandrick loves her and really wants to settle down while it sounds like she still wants to party and have relationships with members of the opposite sex that she is attracted to. That's how I and most of my friends were in our twenties. You can do that responsibly as well.
Feel for Orlando but that is just how life is sometimes. They are both relatively young and rich. I think they will be okay.