Why do we move and the fringes of our social circle.

Having just spent 10 days back in the 'ole country' (yes the land of queues and teas, England), I have started asking why the hell did i move?.

OK, first I should explain that I am quite happy in Denmark at the moment, but having spend longer than normal back in the UK, I met many friends/bumped into friends and saw people that are not close friends but those at the edge of my social circle. The latter group (the fringe of the social circle) is the one that disappears when you move country, as short visits mean that of course you should prioritise your time. However these people also define who you are- whether you want them to or not - there are small events, cultural references, that are experienced together. By moving away these are also slightly loss.