In matrimaniacal societies, in which much of social life is organized around couples, people who are single can feel excluded. Getting ostracized can be especially painful when the people who are excluding you were once your friends – the people with whom you socialized routinely.
There is research showing that as people become more serious about a romantic relationship, they spend more time with each other and they sideline their friends. In the jargon, that’s called “dyadic withdrawal.” I think there is another dynamic, too, though the definitive research has yet to be done: Coupled people spend more time not only with each other but also with other couples; at the same time, they marginalize their single friends.
I wonder about the psychology of this process. Do new couples happily join in with the other couples, proud to be part of the Married Couples Club and to leave their single friends behind? Or do they want to include their single friends, at least at first, but get pressured to exclude them by other couples who want to socialize only with other couples?