You find your communication to be challenging from the start, your interactions tricky at best. You both have come to the relationship with the best of intentions, but you probably find your lover to be very irritating; they offend your sensibilities on a regular basis. Neither of you is directly at fault for the flare-ups that are almost unavoidable between you; the problem lies more in a very basic difference in natures or temperaments.
Your lover is highly attached to their own, individual character and their own view of the world. When you two try to communicate, you find that your experiences of life in general are at odds -- and the likelihood is high that both of you feel threatened by these differences. The problem is that your partner, especially, is attaching their ego directly to their opinions, which means they're unable to step outside their own point of view to see your side of the argument. In a romantic relationship, this kind of challenging interaction can breed mistrust, and trust is essential to a healthy connection. Of course, if you're both hardy, adventurous sorts, you could look at this as a personal challenge: You could both stand to learn a lot from each other, as in this relationship you're required to let go of your own egos and strive to put yourselves in the other's shoes. But without a concerted effort on your lover's part to expand their mental horizons, it's much more likely that you just end up feeling challenged and misunderstood.