By far the greatest predictor of happiness in the literature is intimate relationships.
There is an epidemic of isolation and unhappiness in our society.
If we grow up in a family in which intimacy feels dangerous, then we unconsciously choose people as we get older who mirror our timid approach to intimacy.
In our culture, we don't really learn the basic skills of how to be in intimate relationships.
We tend to disparage intimacy if it comes up at all, or we restrict it to certain people, such as spouses.