When we were married, my wife was a third year medical student (we met in her first year) so there was the stress of med school. This was in the days before limits were put on in house hours for interns and residents. So there was the external stress of med school, which really is stressful, not just for students but for spouses (i.e., me), too. But there was also the intrinsic stress of just being married and inherent personality clashes between a T and F. My wife and I are both very strong N's and I's, so these have been areas of resonance. The T vs. F and J vs. P were a challenge. OTOH, they are also where we discovered complementarity, which led to a stronger relationship once each of us realized this. I had to learn to appreciate my wife's feelings and to validate them, even though I was quite out of touch with my own feelings. Over the years, I've learned to be in touch with my own feelings and understand them, but initially, I had a rather primitive response to my feelings. I think this is common among INTP's, who, if they're lucky, eventually learn to deal with feelings healthily. My wife was a good tutor about feelings. (It must seem strange to INFJ's that someone can be out of touch with and ignorant of his own feelings, but that's the way many immature INTP's are) OTOH, I think that my wife benefited from my ability to be relatively detached emotionally when making decisions as well as my tendency to be spontaneous. When we were first married, it was relatively unusual for a non-physician man to be the husband of a physician. People thought I was really liberated and secure in myself. I thought this was funny, because I just happened to be in love with a woman who just happened to be a doctor. Now that more than 50% of medical students are women, I'm not so unusual. I've had my interests and I've been successful professionally. As an INTP, I have no interest in controlling people, so my wife (as she recently told me) appreciates that she was really free to do whatever she wanted professionally without any interference from me. I'm rather proud of her. We have two sons, both of whom are successful. Raising them wasn't easy, but we talked and thought a lot about the process of raising children while we were doing it. We limited their "screen" time, read to them every night, and always ate dinner together as a family (even if my wife came home late--I gave them snacks to tide them over). I also believe that it's important not to tell one's children what they should do with their lives other than encouraging them to do well in school so as to keep their options open. Anyway, life is difficult for everyone, but if you're lucky enough to find the right partner, it is ever so much easier. When one is loved and supported hard times are a little less hard. Romance is still there for us, and it's lovely.
For us, the INTP/INFJ combination has worked well. But, there is much more to a relationship than personality type. People truly do mature and grow, and as they can grow together they become stronger both as individuals and as a couple.