[It's an easy subject to drop, in part because he knows it's not really any of his business. That's not his purpose right now, and some things you just can't talk about. It has nothing to do with trust. He knows she trusts him.
The subject change has him raising a brow though, a teeny knot of worry forming in his stomach. He still hasn't dealt with this whole... social circle crash? Is that a good word for it?]