Quote (kayeto @ Jun 9 2013 02:17am)
He's not a POV character so we don't see his true reaction. We only see what he presents to Sansa, which is as guarded and deceptive as everything else he does.
He was at least aware of the Lannister/Bolton plans for the wedding if not a part of planning them. My theory is that she was "dead to him" long before her throat got cut.
I agree to a sense. As much as he doesn't want to, he still loves her, hence his affection towards Sansa since she reminds him of Cat so much,