the flayed man is on their damn house flag... they are actively hanging skinned men when they pull up.. there HAS to be stories of what they did to the starks.. and the greyjoy's at moat caitlin..
he knows what the bolton's are... he probably doesn't fully know what ramsey is like... but he knows it ain't candyland up in that bytch... and he left her there anyways.. hopefully with a few knights of her own.. but still... what's that gonna do.. that's gonna be her husband
I feel u. But nah. Roose is sick. But he's a man of strategy, principles and goals (even if they're completely different from the views of non-Boltons).
And frankly... it's not like the Boltons are the only house who endorse sick practices. The Starks do public beheadings. Stannis and his crew burn nikkas alive. Some of the wildlings eat their enemies. None of these nikkas hands are completely clean.
But Ramsay... Ramsay is just 100% a sick fukk. Who's also cunning enough to carry a lie. If u don't know. U won't know. Until it's too late. Like the first men are to Starks, Ramsay is to Brooklyn nikkas. That's how he got Theon.
And if u don't know exactly what Ramsay is capable of, how could anyone imagine THAT? Littlefinger is a snake. And he'll get his. But he's also smart enough to know that he's dead in the north if they find out he gave the last Stark to a rapist, a sadist and an all-around demon of a human being. He wouldn't willingly give her away to... that madness. Not when he could take her back to the veil, marry her to a baratheon instead and still achieve his goals.