Keldaris, you raise some really excellent points. I, too, haven't been super impressed with show Jaime's attitudes, since you're absolutely right that, in the book, he's totally fed up with her antics, backstabbing, and manipulation. I believe it was at the end of AFFC when Jaime got the letter from Cersei begging him to come back to KL and save her [from the Sparrows], and he tossed it into the fire.
Though, the look on Nikolaj's face as Jaime, seeing Cersei get herself crowned, and then they make that moment of eye contact, and he looks, at least to me, a little sick. Granted, it's a neutral expression and is open to any number of interpretations, but if nothing else, it was a huge think Cersei did [crowning herself] that she didn't even bother to discuss with him, the person she claims to be closest to. So maybe with the coming season, HBO Jaime will catch up to Book Jaime and walk away from Cersei and her crap.