A good leather belt doesn't have seams along which to fall apart. It is just one big thick piece of veg tan leather with a hefty buckle on one end (there may be stitching where the belt is folded over to fasten the buckle but it should be heavy duty saddle stitching).

The best belts are oak bark tanned leather. If you google oak bark tanned leather belts you should be able to find a craftsperson in your country making them to order. It will cost more than the belts you have been buying but should last forever.

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That said I also have a couple of belts from high street stores which have held up well, but they are also one piece of real full grain leather.