You are as responsible for another's happiness when you add to it as you take away from it. I am for notion that we are responsible for our own happiness as long as you do not take away from the other person's measure. 'The absence of your contribution to my displeasure gives me a fair chance to account for myself' . You can't keep jabbing at someone and the expectation is for them to sort themselves out and you play no part in reconciling them to their measure of happiness. Unlike other internal or external factors, human beings have this responsibility.