WR, Please keep that text message for documentation. Yes, you've laid it all out for him, but as you can see, it's all about him and his needs. You can't rationalize w/him and he will never "hear" what you are saying. You are what they call "white noise" in his head. I'm so sorry, but you've got to push ahead and get something done about ensuring support for your boys.
Please take care of yourself.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.