Sames attract
I’m awesome, so I attract other awesome people.
But “opposites attract” is much more in the cultural consciousness than studies* arguing that similarity score is the biggest predictor for relationship satisfaction.
Because “opposites attract” makes better art and nothing penetrates the soul like art.
*e.g. Lutz, Catherine J.; Bradley, Angela Christine; Mihalik, Jennifer L.; and Moorman, Erika R., "Perceived Similarity and Relationship Success among Dating Couples: An Idiographic Approach" (2006). Psychology Faculty Publications. 13. This paper goes into more detail and has a good reading list if you want to know more.