A subsequent marriage would definitely be substantial enough to warrant a modification of alimony. Generally, your order was for 20 years. But even permanent alimony can be modified if the needs or resources of the parties changes dramatically. Usually, a subsequent marriage would end your alimony obligation.
There is no hard and fast rule, but absent some very unusual circumstances, it is almost certain that your alimony would be reduced
or terminated in this case.
That said, you will have to file a petition to modify or terminate. It doesn't happen automatically.
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