Treat the other person like you wish to be treated. Think back and find out all that you have spoken during last one week to your partner. Was there any statement that would have hurt him/her? I agree that you felt justified speaking that but what if the same was told to you? How would you have felt? This is the benchmark. Next time you speak with your partner while pointing out a mistake or shout in anger or blame them for something think first about how would you feel if the same was said to you.