He's a)mine, b)married and c)dead. ;)

So what's your point? ;) I don't want to snog him, I just want to cuddle him!

In my head, he's the one who taught Jack how to be human again.

That's very nicely put. That's what I love about him. And although Hwyel and Jack have an awesome sort of dynamic, it's entirely different, and once Hugh is gone you can see that there's nobody who really fills that role for Jack, and you can see him getting more and more distant from everyone.