In my first patch 3 playthrough Astarion didn't try to jump me at night until we had found the drained boar. He offered to keep watch that night and sure enough the next night at camp he made his move. Unfortunately it came after Raphael appeared before I went to bed that night so he did mention being a vampire and Cazador before either had been revealed. The next morning I did talk to him in camp and the rest of the group reacted to his vampiric revelations.
