More often than not in this 3D world we tend to lean towards the most "logical" approach when we make our decisions. And while this may work out for some of our decisions, it may not always be the best way to approach life.
Your heart is a direct connection to source. For example: There is a reason why we "feel" so strongly about a particular person/people or situation in our lives. We are being pulled into that direction for a reason. Even if we are not sure as to what that reason is, it is up to us to listen. Many times the ego tries to "protect" us from what we perceive as possible pain or rejection, so we fail to listen to what the heart is saying. However, is the ego really doing us a favor or just keeping us from a possible path that could lead us to complete emotional fulfillment & abundance on every level due to fear?