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trigs
You didn't, that's just where you'd expect a square taper crank to fail. If you take it apart, you'll probably be able to see the fatigue crack which has built up over a long time which reduced the intact cross section enough to allow a brittle fracture of the remainder as you pushed it up the taper. If you hadn't broken it now, it would have gone at the worst possible time while riding, so consider it a success🙂