Just wanted to say that you all have helped me with this. I am letting go of trying to control him/the situation. This morning I sent my ex the fall tuition bill and let him know the due date for his share. Period. I'm working my head around how to manage with loans etc. if he doesn't pay. I believe I'll be able to simply the delete the snide and taunting emails when they arrive (which they will). I feel better. So thank you.