I agree with all of this, but I do also think it couldn't have been emotionless for them, not with their history. Regardless of his complete devotion to Elizabeth, there was no way they were just going to be able to be businesslike about it (and the KGB knew that when they assigned him that particular mission in the first place, and did it deliberately). I just think that adds a layer of ambiguity to it that Elizabeth isn't able to see due to her (as you point out) hot button about trust and lying.

-J