1998 Chevy 1500 has a bad hub n rotor already took the front driver side tire off and it seems as if all the damage is there where the hub n rotor go on any answers as to what may have caused this?

If the spindle is damaged, it will likely need to be replaced. With such high mileage, anything could have happened; bearing failure or lack of proper lubrication could cause unusual wear on the spindle. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops