Most of my life I've had a model of two "best friends" at a time, and then a circle of people who I considered friends because I got used to them being around with one or both of my "best friends".
Of course, there were also times in my life when I had no friends.
Now my best friend is my fiance- since we moved away from our home-town so I could go to university, I have a few people who bridge a gap between friend and close acquaintance (people who I am comfortable sharing most of my thoughts with, but I don't see outside of school). I am very close still with some of my old friends via social-media and I see them when I get a chance to go home.
Honestly I really like it this way. When I really need to talk to someone I have my fiance and social media, and I know that I'll get to see my close friends a few times in person when I'm on break and have no other obligations to worry about.
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sola dosis facit venenum