The Bull notes the part about Felix. Not because of what Dorian's saying about him, particularly, but because he's saying it at all. If Dorian's mentioned anyone else from Tevinter, it's never been like that - fond, and warm. Someone who actually looked out for him. The Bull isn't going to pry about the guy, but is going to notice it now whenever Dorian mentions him.

"So," the Bull says. "The Inquisition's going to have to find you the good stuff soon, then, unless there's more than one of those kind of guys wandering around for you to get yourself all dressed up for. It seems like a shame to make yourself look that good for such a shithead, though."