Yes. Although it wasn't due to a fight or any sort of drama - we were already slowly drifting apart and forming separate friend groups in our last year of high school, so when we went to separate universities, neither of us made much of an effort to keep in touch
It's natural for people to change as they grow up. I'm always amazed by people who keep their kindergarten/elementary school best friend into adulthood, since the odds of two six year olds still having so much in common and being so similar by adulthood is quite unlikely.