Mind or Heart ?

Life is full of problems. One of it is Love. Sometimes we really need to give up something in order to be in a good situation. Sometimes we really need to be hurt just to make someone happy. But why ? Love needs sacrifice they say. Sometimes, I believe sometimes I don't. For me, If u love someone then why do you need to suffer the hurt ? Before you loved him/her you made promises but why should you pass this process of break-up if you know that he/she is perferct for you? No one ever knows the answer. Its because its our hearts which really needs to understand the way it passes through. We don't know when to be happy and we don't know when to be hurt. But the most important thing is the trust. What if you love two persons ? One is the thing that your heart beats at and one is the thing that your heart dicatates then where will you follow ? Where your heart beats or what your mind dictates ?