Don't fight in the North or the South. Fight every battle everywhere, always — in your mind.

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Don't fight in the North or the South. Fight every battle everywhere, always — in your mind.
😂😂😂#Repost @thronesmemes ・・・ About time Littlefinger got what he deserved! - Credit to @thepixelfactor #gameofthrones #littlfinger #petty
Hi, I’m here to ruin your life.
OOC post
Ok, between receiving my college textbooks today and seeing machiavellianpetyr's post about the difference between Petyr and Littlefinger and I've been thinking.
Petyr Baelish shows some of the signs of having Dissociative Identity Disorder.
For your convenience and my own, I'll be referring to the different personalities as noted in machiavellianpetyr's post, and to the man as a whole as Petyr Baelish.
"Dissociative Identity Disorder (DID) is a severe condition in which two or more distinct identities, or personality states, are present in—and alternately take control of—an individual. The person also experiences memory loss that is too extensive to be explained by ordinary forgetfulness.
DID is a disorder characterized by identity fragmentation rather than a proliferation of separate personalities. The disturbance is not due to the direct psychological effects of a substance or of a general medical condition, yet as this once rarely reported disorder has become more common, the diagnosis has become controversial." (full article here)
While the memory loss is not shown at all, perhaps this is because the personas of Lord Baelish and Littlefinger have flip-flopped so often and so quickly that there is little to no real memory to lose. Also, the more passive identities (Petyr, in this case) are more likely to suffer amnesia (Movies and Mental Illness 3, 3, 31). Seeing as Petyr is so often repressed--to the point where I'm fairly certain he hasn't actually surfaced truly within the canon time-frame--the extreme amnesia wouldn't actually have been shown at all.
As for the etiology, look no further than the infamous duel with Brandon Stark over Cat's hand. Petyr had been a healthy boy, with no real trauma that could possibly trigger anything. Until, of course, he was cut open from navel to collarbone by the man who wanted to marry the love of Petyr's life. This is more than enough trauma to trigger DID, seeing as in The Three Faces of Eve (1957) the very act of having to kiss her dead grandmother's corpse is enough to cause the same in the title character.