Most Helpful Guy
We all classify people around us into quality levels. The nature of the measured quality differs from person to person, but we do classify people. Some people we classify as better than us, some as worse than us, some as much better, some as much worse and a lot as pretty much the same as us. Again, what exactly we do measure varies.
Some people measure looks and fitness.
Some people measure money and power.
Some people measure personality and behaveour.
Some people measure social prestige and reputation.
We measure other people on the scales that matter to us. And most of us would not like to date/mate with a person to far away from ourselves in the scale that we find important.
So a person for whom looks and fitness is important to measure the quality of another person will probably not feel comfortable with an SO that is way more beautiful than themselves. But they may be perfectly OK with a much much more intelligent person. A really high IQ person who find intelligence important will probably not enjoy being with a low IQ person, but may have no problem with a person who look like as scarecrow as long as they're smart enough.
It is about being comfortable together and not constantly be in competition in the scale of quality that we feel is important.0THIS IS NOT RELEVANT ANYMORE