When do you listen to your heart?

Some people will tell me to listen to my heart cause that is where you will receive the truest guidance. Always choose your heart message over your head message, for that is where your Divine guidance resides.  But should you always listen to your heart? You should always follow your heart? When do you listen and follow your heart? When do you stop listening to your heart?
My heart tells me that I love him, that he is my (im)perfectly perfect match but actions speak otherwise.
Is my heart telling me the truth or is it lying to me?
Just another ranting .........