No, you're wrong. He says he never thought about it, and now that it's happened, it makes him sick. He hates it. It's hard to say anything about origin because we don't have (official) access to the characters.
Am I the only one who thinks Astarion is saying the opposite of what he actually thinks most of the time? The guy oozes sarcasm and irony.
Not in this dialog, lol. Most of the time, he is more hypocritical or manipulative, but he is also very picky. If you do something that he doesn't like, you will notice it. He will call you stupid, and it will not be sarcasm. He will really think so.
