Relationships are perhaps the most important aspect of human existence. No one could pass through life without forming connections with people, some closer than others. Of all the relationships, the most important is the romantic relationship.
We are going to spend the most percentage of our time with our romantic partners. They would
typically know us more intimately than any other person would. We would have to bare our hearts out into them, letting out our deepest goals and fears. We would have to let down our guard, become vulnerable, and trust that we won't get stabbed in the back someday. They shape our beliefs, thoughts, ideologies, and mood. Therefore, choosing the right romantic partner is of paramount importance.
According to renowned psychology professor and public icon Jordan Peterson, one thing that you do not want in a potential partner is too much difference in the fundamental domains of personality. This would only result in continual conflict between the parties involved, and not just because they have differing opinions, which of course, they do, but it's really a matter of different kinds of people if we're looking at the extremes. This is a great tip that is useful in eliminating potential long-term partners and assessing compatibility. There is no personality pairing without its shortcomings, but some have a better chance of compatibility than others.
If someone has a Meyers-Briggs personality type that is INFP, the opposite would be the ESTJ personality. If two people with these opposite personalities got into a romantic relationship, there would be continual conflict over many issues. For example, there would be disagreement over how many social outings they should subject themselves to as a couple. The extroverted partner would view his/her partner as odd and socially awkward, and try to drag him/her along. The introverted partner would view his/her partner as overbearing and persistent in trying to pull him/her out of her comfort zone. Even if the introvert does go out, it could be just in an effort to please the partner, not because he/she really wants to, and if it continues, it could lead to some resentment in the long run.
In conclusion, it is advisable that you take a close look at your partner's personality and assess carefully for long-term compatibility before you decide to get hitched. However, it is worthy of note that there is no perfect personality pair, and it will take a fair bit of understanding to make any relationship work.