She didn’t walk off in disgust, but Tegan Jovanka, one of the Fifth Doctor’s companions, did leave because “it just isn’t fun anymore”. During her tenure in the TARDIS she witnessed the death of her aunt, the destruction of 1/3 of the universe, a regeneration by the Doctor, the death of her fellow companion Adric, the departure of her fellow companion Nyssa (who decided to nurse space lepers), many murders commited by Daleks and others and suffered mind rape by weird creatures of the unconscious who were also snakes (twice!). She is last seen regretting her decision and running back, but the Doctor had already departed.
On a personal note, she is one of my least liked companions, along with Amy Pond. Like Pond she was annoying, self-centered and seemed to lack any sense of wonder. Her era of the show had some good stories but I still disliked it strongly because of the stupid glorification of violence, gratuitous melodrama, needlessly complicated and ill thought out plots, excessive and annoying reliance on continuity, a version of the Doctor with serious flaws in characterization and a general disregard for what I consider to be the ethos of the show. Just like Pond’s.
If I were Rory I’d have told the Doctor to go do unpleasant things to himself and take me home. I mean, why shouldn’t he? When has association with the Doctor ever brought anything good to his life? I honestly don’t get why he doesn’t regard the Doctor as a lying, manipulative bastard who’s caused irreparable damage to his family.
