This games durability reminder system is really bad designed, so the OP is not at fault for his mistake. it doesn't tell you when your gear starts to degrade until it's at 10%, which is 5-10 mins from being completely broken.

Why does gear stay white, until 10%, then finally break? Why is there no "Your gear is at 75%, your gear is at 50%, your gear is at 25%" reminders? Why doesn't it turn green/yellow/red? I shouldn't have to manually open my char screen to see my gears durability, that's insanely annoying.