The decisions which you take depend on the circumstances. Once in your life you make the decision with heart and you faced the those matters which you can not expect ever.The decision which you make by your heart was give you wrong results. You said the heart is the full of emotions that's why your emotions became heavy on your mind and you make the wrong decision that is you still facing now a days. But my dear It does not meant that the decision taken by heart always wrong, sometime due to some circumstances and misunderstanding lead us to wrong results . Well your post is outstanding and unbeatable. About 70 percent people take decision by mind. Best of luck for contest.