"My now ex has played my two children, with whom I raised pretty much single handidly. I wasn't allowed to take them with me when I moved out. Over his dead body was he going to pay me child support.""
In some states, you may be able to modify your custody arrangement if you want to. Unfortunately for him, it's a judge who determines whether or not someone pays child support, and not your ex.
The courts tend to frown upon people who try to damage a parent's relationship with their children. I'd talk to an attorney, because your situation seems very unfair.
