The paths your minds naturally travel lead in very different directions and your lover probably ends up looking at you as a stranger -- and not an interesting or compelling one. Instead, they tend to view your intellectual differences as a sort of threat to their own point of view. This doesn't happen right off; in fact, in the early stages of your relationship, they might even be attracted to these mental differences, because they seem so new and intriguing.
After some time, as you get to know each other better, you both realize that your ideas are often incompatible. You're more intuitive than your partner, while they tend to rely more on logic -- and neither of you is able to understand why the other isn't more like you. Arguments erupt, you each take your standard position and there is no resolution because how can emotion or intuition win out over logic, or vice versa? Neither is inherently more correct or reliable than the other, but you both spend plenty of time trying to prove that your point of view is, in fact, the more valid one. At base, your partner is uncomfortable with your leaps of faith and unorthodox ideas, and you're impatient with what you see as their stodgy and unimaginative approach to the world. You have to strike a balance between the two if you want it to work out -- and you have to learn to respect the other's way of doing it.