PDA isn’t any determinant of success in arelationship. If it was, Queen and Prince Philip and Kate and William would be long divorced. Also, ironically, the time of Di & Charles’ biggest PDA (the polo kiss) was when their marriage was going down in flames.

True. But I think Harry is far more transparent. And these two dunderheads have staked their claim on doing PDA in public far more than any British royal I can think of. Harry has been all too willing to leg Megs go first in situations where he didn’t need to. 

Which means that when he doesn’t, it’ll be huge news in their relationship. 

For other people in long-term relationships, it wouldn’t necessarily mean anything. But this relationship has been so short with a long-distance courtship and a short-term engagement to go along with it that they likely haven’t worked out how to function when they’re fuming mad at each other.