This is the passive-aggressive stance many people take during a fight. It's the "Nothing's wrong, I'm fine!" said even when there is clearly something wrong. After all, you didn't used to give short answers to your partner's questions or purse your lips all the time, did you?
John: I was drunk! I didn't mean to kiss her at that party. You're not mad, right?
Jane (stone waller): Sure. I understand.
Jane (stone waller): Sure. I understand.
by Charlotte Dennings July 22, 2011