[She's struck speechless with that, but it gradually becomes less so out of shock, and more... offense, that he would not only keep the entire thing from her to begin with, but downplay it when she had first asked. It reflects easily as her eyes dart over him with insulted incredulity-- and yes briefly, no small amount of hurt-- seeking some kind of explanation as though his expression will give it, before hardening into an icy detachment... that she has no problem directing at him fully as she moves to brush past him]
Not long or apparently important enough to bother bringing up then-- or at all.