Ah, Ianto. That helps explain Jack's exceptionally messy state of being. There's nothing like relationship drama to make an eternity with the same handful of people more hellish than it is already.
"Well... dealing with anything is easier when you're not drowning yourself in hypervodka." A glance at the very empty bottle, then his expression softens. "You've got people here, you know. People aren't great stand-ins for hope, but they're something."