If the companion is the story teller of the Doctor Who universe then Clara is a most untrustworthy one. She only agrees to let go of her lies when there is no longer any way to deny them. Even as Danny confronts her with irrefutable evidence she does her best to weasel out of telling him the truth. What is the point? Why is she bothering to lie to either Danny or the Doctor? She doesnt need to justify herself to either one of them. Perhaps Clara herself doesnt know who she is or doesnt understand she can be more than one thing. Danny joined the Army and presumably saw many fascinating places in addition to experiencing obvious trauma. Hes decided that was enough traveling and he wants to focus on current experience rather than seeking new ones. Theres nothing wrong with that. But theres nothing wrong with adventure either. Both ways of living have their risks. One persons choice is not inherently better than the other.