He's been placed in a difficult position - having taken 2/3 of Cuddy's liver and now feeling indebted to her without ever wanting to. Because he's not House he won't let her know that he considers her sacrifice to be pointless and unwanted.
I think this is one of House's advantages: he alienates a lot of people with his knee-jerkingly honest reactions, but he gets it out of his system (to a certain extent). Wilson OTOH is polite and considerate, ending up with a lot of resentment inside, justified resentment, that breaks out at inconvenient times.

he still hasn't come to terms with what House did with wiping his memory of Wilson
I think neither House nor Cuddy really fathom what House's abandonment of Wilson did to Wilson's self-esteem. He can't blame House -- House was in a worse state than Wilson was when he opted for the procedure -- but that doesn't mean he has resigned himself to the situation. He was just a pawn there, much as he is now.

Thanks for your continued support -- I'm loving your tongue-in-cheek comments and the way you go with the flow here.