Next question is the plug wires. Very common for the valve cover gasket to leak and fill the plug wells up with oil. If the wires had an oil bath for a while, they tend to rot and need to be replaced.
After changing 3 of these belts, it's been my experience to find the old belts in like-new condition when changed out. So I always suspect something other than just the belt being the real cause of these failures. Were you able to determine if anything else happened on your Aveo which might have caused the belt to break?