Though many people believe in the perfect match (not sure if it is 'many' people, but at least I know quite a few people who believe this), my own experience is that this is super hard to find. But to adapt in every way (or sufficient enough) to keep the spark and love going in a RR is mighty difficult. Some (to more) psychologists says: humans, are not made for a single partner. But our culture and in some countries our laws say: Single partner only. Today's culture in my country is to change partners regularly, in series. More than 50% of the marriage break. This was different some time ago, like in the 40s/50s/60s. The culture back then was more like: It's not done to break up. At the same time, the woman in the relationship was not financially independent, so she could not run out. But today, many women are financially independent, and I believe because of that, we see so many breakups. At the same time, we see an enormous increase in people deciding not to go into a traditional RR. I suppose, many prefer not to make all the adjustments needed, and try and live with those adjustments for all the reasons you mentioned. I do wonder how the world will look like let's say 20, 30 years from now. We will see an enormous increase in technology in all aspects, from VR++, to AI with human-like features. Will we be satisfied through technology more and more, and leave the traditional RR behind us? With the ever-growing number of singles, I can imagine the RR will fall apart into friends with benefits and friends ending up in having multiple partners, but in a modern sense, ie not through traditional RR.