It's a thin line between love and hate, as they say. You two frequently have a hard time getting along. Even though you like to think things through carefully and logically, your lover doesn't operate that way; they're used to acting and reacting, which could actually intimidate or at least annoy you.
Things probably started out okay, but then you found yourselves in repeated arguments, often over the silliest subjects. If you try to trace what happened, you'll find that some minor irritation occurred somewhere along the line, but instead of just glossing over it and moving on, your lover picked it up and ran with it, making a mountain out of a molehill. Misperceptions and projections run rampant between the two of you; you see the other as being untruthful when really you aren't being completely aboveboard yourself, or you might think that your partner is constantly spoiling for a fight when really you're the one that starts most of them. Even the more even-tempered of the two of you can fall into this kind of behavior; you just draw it out of each other, as if you can't stop from saying nasty, unnecessary things. Over time, if it hasn't happened yet, you may start to feel less like lovers and more like enemies, unless you can somehow figure out a way to nip this problem in the bud before it really gets going. Behavioral patterns are hard to break, but the continuing survival of this relationship needs you both to work on it.