Do I have a case to sue if ex didn’t comply with our agreement?

After a 16 year separation, my ex filed for divorce in 2005. We used a paralegal to file the papers. We have 2 houses, one was a rental property and one was our family home. In the divorce papers, she asked for $1000 per month, but verbally told me don't worry about paying her. She told me to handle the payments on the rental property instead and she would handle the other. I eventually moved in to the rental house, and she remained in the family house. The divorce docs also said that we would settle up on the property at a future time, or if one of us remarried. We are both single. I am now retired, disabled and asked her to settle the properties. Her house is worth much more than mine and she has received a $250,000 inheritance. Her response was she didn't owe me anything because I never paid her the $1000 per month per the divorce decree. Stupid me for trusting her promise that I didn't have to pay it before. In 10 years since the decree, she never said a word about this, but I do have an email she sent when I inquired about future real estate settlement, which she stated that we would settle in the future and no mention that I owed her anything.