During the confrontation Tav is mortal, so I think it's still just the game making assumptions that Tav is selfish and shallow from that moment on. It's sloppy for many reasons. And if that's what they wanted to portray they've done it poorly because, despite AA becoming more arrogant and possessive, he also shows more love and thoughtfulness when Tav agrees to spend eternity with him and stays loyal to him. AA actually hints that they are basically married, unlike spawn who never defines the relationship.
