When you trust someone implicitly you will absolutely convince yourself that you’re wrong in the face of h the their lies. Even if the thing they’re lying about is in plain sight. You don’t want that trust to be broken, so you convince yourself it’s you.

It doesn’t matter what the topic is, a lie is a lie. She made a statement and was lying about it. Even worse, she’s angry that he is masturbating—so i can see how he’d convince himself he’s wrong.