Arthur knows he's not immune to that type of thing, but he also doesn't like the idea that he has to be protected from anyone. Especially by Eames. They've been doing okay behaving like they only benefit each other by being together but aren't at a disadvantage apart. Arthur doesn't want that paradigm to change.

"Okay," he says, "I'm sorry." He actually sounds genuine, if not a bit impatient. He knows Eames meant well, probably, and it wasn't some gross powerplay to keep Arthur away from making any connections among the fae.