"Oh, I neglected to mention him, didn't I?" Well, it probably means that Anders trusts Raine, if he just blurted something like that aloud to them. And he was right to do so, since they just immediately accepted it and even spoke like it was something to be proud of.

He kneels down to gather up the elfroot at Raine brings it to them. "I must say, I've never heard of a symbiotic relationship with a demon. You'll forgive me if I immediately jump to the conclusion that said demon was just using their human partner to sate their own needs and desires."