Surely Harry must've been on the recieving end of some foulness by now?
And to add to what Thedom says, I'm afraid I've seen this kind of situation at first hand. A narcissistic and very difficult person (who happens to be physically drop-dead gorgeous) is indulged to the nth degree by her adoring partner, to the bafflement and frustration of everyone else.
It's summed up perfectly in the 'What Meghan wants, Meghan gets' uttered by Harry when some horrid, mean flunky was stopping her getting the tiara she wanted. (being the formidable and very professional Angela Kelly!!).
If you've experienced this kind of behaviour IRL you don't need much convincing that Harry must just adore Meghan, whatever she does to him or anyone else. It's really frustrating for the rest of us who have to play do different rules in life! She's certainly cast a spell of some kind.