im not eloquent enough to properly explain myself but like. i feel like people don't give tin enough credit
just because he didn't understand that phob was part of the revolutionaries, it doesn't mean that he is dumb or naive. he actually understands the consequences of the revolution more than anyone else, even more than phob himself. because phob fully believed he could hide tin away in their home and shield him from everything, but tin is fully aware that he cannot. phob was only worried about tin understanding him, but that was never the problem
i really don't know how to explain it, but like..all his life tin did what was expected of him. he was prince thinnakorn varakulvathin, the only hope of his family. 11 years ago, even if it killed him inside, he even let phob go, because he thought that was what he had to do. even when phob came back in his life, he fought his own feelings with all his might, he fought to keep the mask of prince thinnakorn, but in the end hope won. the hope of being just tin who loves his ai'phob. and for a while he lived in a beautiful fantasy where that was possible, but the revolution and phob being part of it brought him back to reality
because here's the thing: as long as they were tin and ai'phob, they could have run away. but now phob is captain phobthee, a prominent figure in the khana ratsadon movement, and tin can no longer escape being prince thinnakorn. tin understands phob. moreover, tin never blamed phob, even when everyone else around him did. but phob believes they can still be tin and ai'phob despite everything, while tin knows they can't
they can't because in the end it doesn't matter what TIN's beliefs are or what HE wants. it doesn't change the fact that his father is one of the leaders of the blue ribbon faction and that he will never surrender. phob may trust tin, but to all the other revolutionaries he is a threat simply because he is a varakulvathin. and neither of them can change that. that's why tin asked phob if he would do it again, that's why tin said that now they're two people who can't love each other, that's why tin has to walk away from him again. because phob believes in what he's doing, and to be with tin he would inevitably have to go against what he believes. he would have to make exceptions just for tin, but that's not how it works
and so tin has to go back to being prince thinnakorn, with all the weight of his responsibility. he has to bury his love for phob once again, he has to find a way to keep his family safe while his father is actively against the reform, he has to work to repay a debt that's not his. and the only person he's blaming is himself: for being selfish, for daring to choose his own happiness, for wanting to be just tin
yes, tin is not the revolutionary nobleman that everyone wants him to be, he doesn't have society and the people as his main priority, and maybe that makes him a hypocrite, but all he ever wanted was just to be tin who loves his ai'phob
unfortunately, they can't just 'go back to how they were' like phob wants. they can't just be tin and ai'phob anymore, they can't pretend they're not standing on two opposite sides of the revolution and they can't ask each other to abandon everything for the sake of their love. so they'll have to find another way. a way for prince thinnakorn and captain phobthee to exist alongside tin and ai'phob. because they still love each other. that was never the problem. the problem is that they can't love each other the way they did before, and now they have to figure out how to build something new from the wreckage of it