[st96badboy]

Well that sucks. I think you answered your own question.. when it chewed the belt to pieces it was slipping and causing excessive heat. That probably weakened/damaged your clutch. You most likely had some issues.
Maybe alignment, clutch engagement, air flow (A blown belt can completely clog the air flow with belt pieces), dirty/stuck clutch ..

Maybe crank end play?

I have a detailed post on clutch issues...also you can add air flow to keep temps down or run no clutch cover if you keep it your car dry.