When they've been with you for over a decade or longer. 1. Familiarity - They're normally your go-to people and have been for the longest time. You can't imagine anything living without them and it's hard to really look past a lot of things without them in that picture. Can't tell you how often I'd get frustrated trying to tell new friends all these experiences when they barely know anything of it - because they aren't the person those things originated from. 2. Secrecies - 1st person that nobody knows you better than is yourself. But the closest 2nd thing behind that is who you talk to and tell everything to - your friends. Having long-tenured friends, especially with a decade or even longer, by this point they'd really know more about you than the average person you come by. Some, more than your family and you practically entrust them in stone to carry certain things til death. 3. Hard to make new connections - I've believed for the longest time that friends are disposable. Puzzle pieces that can be replaced and in comes a new piece that may fit better. Though, putting more emphasis on something that I already covered for the most part. Without certain pieces, it can be difficult to carry on with yourself without everything that built up to where you are mentally or even physically. Even harder to allow new people coming into your life and almost expecting them to suddenly know everything and all the sentimental backlog of history with old ex-friends. They just aren't going to click so easily. Such is my predicament.