Dear Ex-husband

So yesterday, I decided to account every money you sent, it may prompt you to remember that you have obligations. Lo and behold, your response with a shiny screenshot of transfer for half of the dues you left for school. No more, no less. I responded but never said thanks. How can I say thank you, it is your responsibility after all. Maybe that's the reason why I never got a response when I asked will the kids be able to go to the same school without hassle? This attitude of yours of entitlement is what makes it so difficult to deal with you.