A photo would help, as would knowing the width of the tire and rim.
Your problem could be caused by "hoop stress" -- the outward force of the inflated tire. Hoop stress is equal to the pressure X the tire width. Also, brake track wear could have thinned the wall making it weaker.
Other factors could be damage caused by the mounting process, or road damage.
I provided the above info just to list possibilities, but short of specific details and, hopefully photos showing th damage, it's impossible to form any kind of opinion.
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