Earlier quoted context omitted.
Not disagreeing with your main point, but twin studies show that marriage status account for only 1% of variance in happiness. So maybe the idea that most people need a romantic relationship to be happy is a little overblown?
Do you have a particular study you could point me to? I do find twin studies useful. I found https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3629371/ which addresses a variation of the question. The unpaired half of twins with discordant marital status show significantly (in the case of men) higher rates of depression; women also seem to too, but because there were so few twins of discordant marital status in general, t…
Thanks for sharing the findings of your quick research. Depression score is indeed not exactly the same as happiness, or life satisfaction, but for the purpose of our conversation I would say they are all close enough to what matter to us, so they are all sufficiently meaningful (and probably very correlated to each other).
Eyeballing the paper you cited, there appears to be evidence that widowed and divorced people are more depressed, but not single people (compared to the baseline, married people). At least when running the regression with all the other important variables controlled. Am I reading it wrong?