I think its bad writing when you go from a girl who basically will do anything to keep you safe (ie kill) then go to someone who says that there is NOTHING between them is bad writing. Yes Julian has been majorly mishandled by Marvel. But first off don't blame Mike Carey for Julian. He had a plan for Jules, but alas he never got a chance too see it through.
But going back to the topic at hand (hehehe), if she had told Julian what she had told Gambit I think a lot of people would less angry with the whole situation. But How in a span of maybe a dozen issues you go from risking your soul/killing someone/ect to saying there is nothing between them.
Just my opinion. I personally think Liu is a great writer, but the stuff she's put out in the last year and a half too two years has just been bad. Still love her work with Daken though.