Itachi didn't know whether to believe him or not. So he simply sided with politeness.

"... Likewise."

He kept his mangekyo active until Obito had walked out of sight, and then let it fade away. He let out an uneasy breath. Things could have gone... much worse...

He thought for a moment about ordering another cup of tea, but his body was shaking as badly as his mind was reeling. He decided that one broken cup was enough, and instead, made his way into the street, in the opposite direction.