Accepting the dissolution of a relationship is just as difficult as accepting the dissolution of a business. When you think of all the time, energy, effort, resources and thoughts you put into the relationship, it hurts that it has to come to an end and you try to do whatever it takes to salvage it, but when would you know to pull the plug?
When medical practitioners are performing CPR (cardiopulmonary resuscitation), they apply manual pressure to the chest and blow air into the lungs through the mouth, mimicking the natural process of breathing in and breathing out, thereby circulating air into the bloodstream that carries it into the brain to avoid the risk of brain damage.
Pressing too hard on the chest would break the diaphragm which could put a hole in the heart causing instant death or rupture an organ which could be critical or fatal.