[Reek wasn't entirely unintelligent. Ramsay had hoped this would be easy, but the man's laid the groundwork out for him.]

The Starks know that Ramsay Bolton is here, neither of us can change that. If I give them no cause to come after me, it's my hope when our paths do cross they'll abide by the laws of the city and keep from decapitating me on the spot. [He knows it won't. He knows that his wife and her bastard brother will make efforts to seek him out and warn all they meet about him. That doesn't matter.]

And to keep them from sniffing after me, I've taken another name. Then no matter what they spread, I'll not have to deal with the mistrust you've shown me. [And it's pretty rude of Reek to subjugate him to it, his tone suggests.]