Harry wanted out for a long time before he met Meghan. Anyone blaming Meghan for him leaving is a fool.
Yes, he did.
I think Meghan provided a perfect escape route but I do think he could have announced that he would not be continuing as a working Royal and that they would be going to live quietly in America, when they got engaged or during the engagement.
They could have had a lovely, quiet private family wedding at their own expense, like his cousins, not the huge occasion it was, funded by the taxpayer.
Frogmore would not have had to be refurbished at such great expense (the taxpayer was refunded, I believe).
They would not have to undertake Royal tours, taken on huge projects such as the Commonwealth Canopy etc.
The huge publicity they received and the consequent drama of their departure caused a media frenzy so no wonder the press were camped at the door of their new home.
None of that need have happened if they'd said au revoir as soon as they married.