Why Does Sansa Have Littlefinger Killed?
This Is Exactly Why Sansa Makes Her Final Decision About Littlefinger
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Selling Sansa to the Boltons
Under the guise of keeping Sansa "safe" from Cersei and letting her "avenge" her family, he takes her north to marry her to Ramsay Bolton. But really his plan is to use the Boltons' marriage to the Stark family as proof to Cersei that the Boltons are betrayers. It's unclear what he most hoped would happen, but likely he wanted to have to "rescue" Sansa from the Boltons at Cersei's behest and then marry Sansa himself, with Cersei declaring him Warden of the North.
That not only gains him immense power and helps him worm his way into Cersei's good graces, but it gets him the next best thing to Catelyn Stark — her look-alike daughter as his wife.
