This gets a curious glance, but Cal doesn't ask. If Ianto wants him to know, Ianto will tell him.

(And quite aside from all that, there's something pushing him away from asking. The subject of dead girlfriends is one that Cal is to be discreetly steered away from.)

The second item rates a nod of recognition, though. "Yeah, the alien thing. Sounds like something that'll get you tenderized every now and then."