It is much simpler than this. Humans are social animals, we need upto 1000 close family members. Not friends, not colleagues, not church members - relatives. They should be really close, like you should see them almost every day. If you don't you develop unhealthy relationships with people who really don't care about you much. And this means you are alone in this world and you must be stressed - something is going to happen and nobody is going to help. This is natural reaction to an abnormal situation.