In my opinion I think is more that believing to your heart because your love could be bad for both so in that kind of cases you need to take a hard decision and not what your feeling want. But I think that believing to your feelings is one of the best things you could do because is extraordinary what you could do with your feelings. Trusting your feelings is one of the most important decisions you make because love is a good way to start a new life.
Trusting your feeling could be very dangerous to because you are not thinking with your brain you are thinking with your heart and your feet. Decisions are important in these moments because any decision could change the life or it could show the other face of the coin. That is why you should think with both because any decision you are going to make first with feeling and then with the brain.