In matters of love, should you follow your head or your heart?

Use your head B, your heart will catch up eventually. The heart has no place in deciding the affairs of marriage. " These were the words of advice so wisely offered to me by my newly married male friend Bode when I presented to him a relationship dilemma. The problem with this seemingly Sage advice is that I think with my heart,  not my head, as do a lot of women in relationships.
We know that in relationships and when faced with problems men tend to think with the logical right side of the brain, and women, with the much more emotional right side of the brain.
I'm in a relationship fix right now. My head argues that he's matured enough age wise, he's got a good job, he's Nice -albeit a little boring and predictable - he's obviously ready to settle down and he's totally obsessed with me. The thing is, my heart says a big NO!  There no chemistry whatsoever ,there are no butterflies in my stomach, there's no thrill, he just doesn't... Do it for me. In essence, there is no tza tza tzu in the pit of my stomach.
So I'm really torn about what to do. Do I act logical like Bode advised and listen to my head,  or do I wait for that feeling in my heart that tells me when something feels wrong or right, that little tug in the pit of my stomach? Is there a middle ground, a meeting point for logic and emotion to agree in a relationship?
When it comes to a relationship, is it better to use your head or your heart?