While Ratan is emotional fool, Diya is a rational fool too.
He is responding to a real and dangerous situation in an emotional manner. He is not able to see who the real culprit is and blaming Diya. And even that he is not really able to handle well. He is punishing himself more for trusting her rather than really trying to eliminate her as a risk.
While he is doing this Diya is expecting a rational response from an emotional man. She is expecting him to behave and think in a fashion which he is not used to at all.
Her act of coming back is not going to mend things for them. Unless (and even after) she catches the culprits, there will be a lot of guilt, unkind words and unresolved emotions which are not easy to fix, unless they both learn, how other one functions.
Here our Man is from Venus and the Woman is from Mars. :-D