You want to cooperate with each other, but instead, somehow, you get into power struggles again and again. The intensity of this aspect can be mitigated by other, softer ones that promote harmony between you, but in general, this one is hard to deal with. Your partner tries, consciously or subconsciously, to force you to change, because your methods of processing the world and your place in it don't match up with theirs.
You're much more intellectual about things than they are, and you probably push them to take a stand on their principles, or worse, to define their feelings in terms of logic. Logic, of course, doesn't apply to the emotional realm, as they're two completely different processes. And what happens when an emotional person is pushed relentlessly? That's right -- those emotions tend to explode! You both take your own side in a serious and dogmatic way, clinging to your own beliefs so fervently that you could forget there's any other way of experiencing the world. In some big ways, you just disagree -- on spirituality, sexuality, you name it. Instead of trying to listen to each other and respect your differences, you're tempted to put each other on the spot and try to force each other to defend your position. Challenges like this can be really hard to deal with, and could make you feel divided as a couple from time to time. On the other hand, this relationship has also pushed you to define yourself in ways that you've never thought of before.