Well, my case is opposite with you. For some reason, the friendship in college years is breaking up. I just graduated last year, but I feel so distant right now with them. We're rarely talk. The last time I met and talked to them was last October.

Meanwhile, I remain in contact with my high school friend. Well... Actually, they are my childhood friends, since the primary school. We went to same high school and separated our ways in college years. But most of my friends are closer to the high school friends rather than the college ones.

I ever heard some people have long lasting friendship from job environment too.