[The pseudo teasing smile drops as Arthur says his next words, and Merlin shakes his head.]
Don't--I told you: you don't need to apologise.
[Apologising means Arthur making a big deal out of what had happened, and Merlin doesn't want that. It's been two years, he's put it behind him, and he doesn't want to look back (too often). He's made too many mistakes, and he spends too much time considering those "what ifs" on his own without Arthur bringing them up, too.]
no subject
[The pseudo teasing smile drops as Arthur says his next words, and Merlin shakes his head.]
Don't--I told you: you don't need to apologise.
[Apologising means Arthur making a big deal out of what had happened, and Merlin doesn't want that. It's been two years, he's put it behind him, and he doesn't want to look back (too often). He's made too many mistakes, and he spends too much time considering those "what ifs" on his own without Arthur bringing them up, too.]