Almost Schmidty

Martin and Schmidty, friends. The best of friends. Chatted their way through cricket, books, impossible futures, hikes, locker room debates and night wanderings. Not girls: Schmidty was hopeless at the cricket dance, the school social, the Culture Vultures' party. They had lifetimes of it. Lifetimes.
How did they lose it? How come?
How do you lose a friendship?