Emotional detachment

http://en.wikipedia.org/wiki/Emotional_detachment

Second sense: mental assertiveness

Emotional detachment in the second sense above is a positive and deliberate mental attitude which avoids engaging the emotions of others. It is often applied to relatives and associates of people who are in some way emotionally overly demanding. A simple example might be a person who trains himself to ignore the "pleading" food requests of a dieting spouse. A more widespread example could be the indifference parents develop towards their children's begging. It is not to be confused with being wilfully cold or unpleasant, because it is a positive mental attitude. Of course, the decision as to whether emotional detachment in any given set of circumstances is considered to be a positive or negative mental attitude is a subjective one, and therefore a decision on which different people may not agree.

This detachment does not mean avoiding the feeling of empathy; it is actually more of an awareness of empathetic feelings that allows the person space needed to rationally choose whether or not to be overwhelmed or manipulated by such feelings.