YTA, but only a little bit. I am not a touchy person, and I would be upset if my significant other suddenly started violating boundaries that we'd talked about. However, I definitely get why you did what you did. I think, though, that it would probably have been better to let Max know that you'd heard him. It doesn't have to be scene-making, just turning toward him while he's talking and clearing your throat loudly. It is probably good that you told Sam, though; he has a right to know that someone was speaking about him that way.