It's a curse of some kind- it has to be. I mean, look at the other men who've traveled (even briefly) with the Doctor! That Adam kid (jerk though he was) ended up with a permanent opens-at-a-snap hole in his head. Mickey (also) gets turned into plastic, then loses his girlfriend (to the Doctor) and hops universes! Wilifred- well, Donna. It's a thing! XD

Hee. Well, color Jack jealous that the TARDIS gets an exception and he doesn't. Also, River? Oooo! My headcanon totes has Jack with at least an awareness of who River Song is, in that "the woman who killed the Doctor," because hello Time Agent, plus River spent a LOT of time in the 51st century. >.>