"It's not that I don't trust you." Defensive. But he doesn't know what to follow that up with. It wasn't because he didn't trust Obito; it was just... He was not Itachi. It was different.

With Itachi he didn't even need to say a word. Itachi understood him, and it was the same the other way around.

"You don't come to me with your problems. Why am I obliged to do so instead?"