In our divorce agreement, we agreed to split the cost of our daughter's education. She has now graduated college, and each semester we called him to let him know the cost of the student loans. Each time he said we would settle up at the end. Now the loans are in repayment in my name. I've sent a certified letter to him with all of the loan details and have gotten no response. I need to sue him but I live in Delaware, he lives in Parsippany NJ, and the divorce was in Passaic County NJ. Where do I file to sue him?