Belt tension plays an important part in life expectancy, if it was too loose it could have been slightly damaged each time you started the engine, causing a little slippage and wear at certain spots. Once that area is damaged it will continue to wear. Also, take a look at pulley alignment AND the plane of the pulleys compared to each other.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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