Well if you only hang out with one group primarily then it is understandable to become trapped in the group. Fear of being alone, isolated and becoming depressed. Strong motivation to stay with what you've got. But also maybe you like the people in the group, genuinely take an interest in the group - that's another cause. I can't say I'm in a group, it's really more like an assortment of friends loosely connected and occasionally brought together (party) But we are not roaming the streets as a single entity LOL
