Heartbeats are like an alarm that alerts you every time about what state you are in. Sometimes it beats faster than usual which tells you that you are anxious about something and sometimes it beats slower than usual which means you are very calm state of mind, and finally when it beats as usual which means things are pretty much routine.
It tells you many things about what is going on in your life and how you react to that particular situation. People often say either you listen to your heart or listen to your mind. The difference between the two, in my opinion, is that the former tells you a more practical and rational approach, and the latter tells a more emotional approach to deal with the same situation.
In every situation, I believe we should listen to both hearts as well as minds because anything in isolation is not good. We'll have a situation where we can make a decision based on the combination of both of them.
Listening to your heart sometimes gives you peace and harmony which is very much needed to keep your mind calm.
Lastly, the Heart is a very important organ for the functioning of the body, to keep our heart happy we should listen to our heart and at least give fair justice to whatever decision we make in our life.