The question is not whether you should follow your reason or your heart? For we can not separate the heart from reason and vice versa. The heart and the reason are joined, connected by the tree of life. This coexistence heart-reason is part of every individual since it is the very essence of the human being. Rivalries arise when one or the other of these factions does its own thing.
Reason is the individual mind in every person, it is the mind that thinks, imagines, makes decisions, is action, organizes, analyzes and is expressive. Reason or intellect is often associated with the "masculine" principle in man or woman.
The heart is the seat of feelings, sensitivity, impulsivity, intuition and creativity. The heart is assimilated to the essence of being: this is where our inner being is lodged with his deepest feelings, emotions, pleasures and desires. It is the "feminine" part in each of us.