Every time I rewatch and Alex says 'no such thing as a locked door when you're a prince, I suppose,' it makes me think about keys and how they're used in relation to Henry in the book vs the movie. In the book, Henry says:
“Funny thing about being a prince—people will give you keys to just about anything if you ask nicely.”
(Which that line from Alex is obviously a nod to)
And it creates this nice juxtaposition between Henry, the prince, who can go anywhere he wants, who has this illusion of freedom, vs Henry the man who is trapped in this life and sees no way out. (Although, by the point that he says this, he’s already starting to see that freedom in Alex.) And I love that! But I also love the changes made in the film. Instead, we get this (paraphrased from memory) exchange:
“You know, I don’t think I’ve ever owned a key in my entire life.”
“No such thing as a locked door when you’re a prince, I suppose.”
“Well… You’d be surprised.”
So, here, it's used to emphasise Henry's situation and how he feels trapped in his life—literally without a key to get out. Until Alex. Alex unlocks Henry's life
And, so, the symbolism of Alex giving Henry his actual, physical key, after Henry gives him the ring, is strengthened by Henry never having had a key. Like, Alex is literally the key to unlocking Henry from the shackles of his life, to unlocking Henry full stop. Henry has never had a key—metaphorical or literal—until Alex.
And it's just... It's really lovely, the way it all ties together! That conversation from their first night together, to Alex giving Henry the key, and to him using it to bring Henry into his home, the way it all circles around. And the idea of love setting him free—it does sound kinda corny when you say it like that, I guess, but it's really a beautiful thing. The love he thought he couldn't have, that he initially ran from, is what allows him to be himself. Being queer and loving a man—the parts of himself he thought he’d always have to hide—is what frees him
There’s definitely more to say and I’m not even saying anything new but I was just thinking about it and wanted to ramble a bit even if I’m rambling about very obvious symbolism lol
(As an aside, I do want to mention Henry grabbing that random key from like under the rock, or whatever, as he leads Alex out of Kensington Palace. I mean, I'm sure it's more of a communal key, or something, so it doesn't 'belong' to Henry, and they still have to sneak out under cover of darkness, but it might muddy things a little? I'm not sure. Maybe it fits in because it’s when he’s starting to allow himself to think of the possibility of being open and being with Alex. I do know the idea of, in the universe of the movie, there being a key to the gates for Kensington Palace under a rock right by said gate is so funny to me though)