1990 GMC 2500 Pickup Q&A

1990 GMC 2500 Pickup Question: A belt in my truck has broken. Help?

This morning I walked outside towards my truck and I saw that there was a belt laying on the ground broken underneath the truck by my tires. This is the first time it has ever happened. Is this a major $ problem to fix? What could possibly be wrong? It was running great as of late. -
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