That little display with Harry sitting beside her on the couch while she giggled and made tha exaggerated curtsy while mocking his grandmother should have been an eye opener for him because it showed what little respect she had for him. Don't think his family missed that. She drives him and the wedge. They are both genuine tools.
It has taken me a lifetime to realize something that I actually first saw in HS...and that is that many if not most men will betray everything and everyone (friends, family, children, integrity, wealth, and country) for a certain woman.
I think it mostly has to do with the addictive power of sex (and other brain chemicals). And it depends on the woman.
It is really an amazing thing to behold.
As an aside, this Harry and Meghan thing reminds us of the power of a femme fatale and just how effective a female spy can be during a time of war.
Some MI6 agents need to abduct Harry for deprogramming. This is a job for Bond.