It doesn't seem possible, but Cade deflates a little further, watching Beleth go with a look that is both hurt and unsurprised. It's been a long, long time since he made anyone happy, it seems, and the most he can do these days is stay out of the way. Avoid making them angry. But apparently even that is beyond his capabilities!
He stands there awkwardly for several moments after Beleth goes, then looks back at Alistair with a similar expression: I know you hate me, but you're still all I have.

He comes forward a few steps to look into the cell, frowning. Is there even anything worth saying?
"I'm sorry," is all that comes out, in a barely audible mumble. "...just...." He pauses for a while, trying to think of something else to say. "...don't take the lyrium, if you can avoid it."