Astarian is much friendlier -- which is strange since he and my toon disagree on nearly everything. Before he started out conversations with "you're staring again"and a scowl and now it's "well hellloo" and a smile.
Actually as far as I know thanks to dataminig people, it was just a bug. He was rude because he was using his "you did too many Astarion-disapprove choices" greeting at the beginning.
Unless you mean you really earned this greeting after some time :P