One more thing: all of Jack's big traumas? He inflicts on other people. It's an interesting pattern. Look:
Torture: we know it happened to Jack (he mentions it in "Captain Jack Harkness"), and we know Jack tortured other people, and routinely, too (he mentions it in "Countricide", leaving it open whether he did this as a Time Agent or when with Torchwood, but he did it; also arguably his treatment of Beth was torture).
Loss of memory: he retcons people left, right and center.
Abandonment by person(s) he cared for and looked up to without explanation: see also Jack running off at the end of "End of Days".
Resurrection into immortal state: hello, Owen. (Except for Owen getting the darkside treatment of deathlessness as he's not instant-healing but instead superfragile, with every wound forever and no way of knowing whether he'll drop dead the next second or in a millennium.)
And now for the big one, the thing everyone pities Jack most for, i.e. the Doctor's "you are wrong" statement (which btw in Utopia is followed by the Doctor admitting he's wrong to feel that way and apologizing to Jack, but somehow that part never gets quoted): Hello, Owen (again), with Jack's opening statement in "A Day in the Death" while (temporarily) firing relieving him of duty.
no subject
Torture: we know it happened to Jack (he mentions it in "Captain Jack Harkness"), and we know Jack tortured other people, and routinely, too (he mentions it in "Countricide", leaving it open whether he did this as a Time Agent or when with Torchwood, but he did it; also arguably his treatment of Beth was torture).
Loss of memory: he retcons people left, right and center.
Abandonment by person(s) he cared for and looked up to without explanation:
see also Jack running off at the end of "End of Days".
Resurrection into immortal state: hello, Owen. (Except for Owen getting the darkside treatment of deathlessness as he's not instant-healing but instead superfragile, with every wound forever and no way of knowing whether he'll drop dead the next second or in a millennium.)
And now for the big one, the thing everyone pities Jack most for, i.e. the Doctor's "you are wrong" statement (which btw in Utopia is followed by the Doctor admitting he's wrong to feel that way and apologizing to Jack, but somehow that part never gets quoted): Hello, Owen (again), with Jack's opening statement in "A Day in the Death" while (temporarily)
firingrelieving him of duty.