He mistrusts her, probably views her as some sort of spy (as if she isn't). Why wouldn’t he want to know why a pureblood woman, from a Sacred Twenty-Eight family, would break her engagement and end up in a small Albanian village? Only a train ride away from where he enacted his own clandestine plans? Hermione would like to know just as much as Tom, and despite her time spent within this body, within this timeline, she still feels no closer to understanding. 