Based on the "Already Tried" section, it's good to see you at least have a sense of humor about it all!
You need to start with your divorce decree. It most certainly should detail the spousal support. The details would include how much you pay, how you pay, when the payments were to start and, most importantly, when the payments end. If there is no end date, the presumption is that the payments are permanent.
If this is the case, you would need to file a petition with the court requesting a modification of the support. To make such a request, you would need some change in circumstances, such as her improved financial situation and your new family to support.
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Attorney
I have 15 years experience in the legal field, currently specializing in criminal and family law