[Jack doesn't laugh at that suggestion because it isn't funny and he doesn't have enough of anything in him to fake it either. But if he feels guilty around Gwen, he can only imagine what he'd feel like if he stuck around Sulu. At least Gwen had 3, 4 years spent with Ianto. Sulu hadn't even gotten one.

He takes in another deep breath, not as quietly as he did before, trying to ease the tightness in his chest a little.] I'm not sure that that's a very good idea...