Remember that time when they lost it? You reeled from their onslaught and had to stop reacting with resentment? You had to tell yourself that it said more about their state of mind that it did yours, that it was a reflection of where they were, not of where you are?
Surely this is the best way to live? But at the cost of calmly looking deep inside to understand if you did make a mistake; if you put less than your best in? Sometimes it is better to understand that it was you. And you can always do better.